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Easy Study Notes: Solve Simultaneous Equations Graphically

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Easy Study Notes: Solve Simultaneous Equations Graphically
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laila

@la1la

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Learning to solve simultaneous equations graphically requires understanding how to plot lines and find their intersection points.

The key concepts involve:

  • Plotting two or more equations on the same coordinate plane
  • Finding the point(s) where the lines intersect
  • Interpreting the intersection point as the solution that satisfies both equations
  • Understanding when equations have one solution, no solution, or infinite solutions

When exploring methods for graphically solving simultaneous equations, students first need to rearrange each equation into slope-intercept form (y = mx + b). This makes it easier to plot the lines by identifying the slope (m) and y-intercept (b). After plotting both lines carefully with proper scaling, the intersection point represents the x and y values that make both equations true simultaneously. This visual approach helps students better understand the relationship between the equations and their solutions.

Graphical solution approaches for simultaneous equations also reveal important mathematical concepts about the nature of solutions. When lines intersect at exactly one point, the system has a unique solution. Parallel lines never intersect, indicating no solution exists. When lines are identical and overlap completely, the system has infinitely many solutions. This visual representation makes it easier for students to grasp these abstract concepts compared to purely algebraic methods. Additionally, graphing helps verify solutions found through other methods like substitution or elimination, providing a valuable way to check work and deepen understanding of how simultaneous equations behave. The graphical method is particularly useful when dealing with linear equations, though it can be less precise than algebraic methods due to limitations in measurement and scaling accuracy.

13/08/2023

421

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Understanding Graphical Solutions for Simultaneous Equations

When learning to solve simultaneous equations graphically, students need to understand the fundamental concepts and visualization techniques. The graphical method provides a visual way to find where two equations intersect, giving us the solution that satisfies both equations simultaneously.

The first step in methods for graphically solving simultaneous equations involves plotting both equations on the same coordinate grid. Each equation represents a line, and where these lines intersect gives us the x and y coordinates that solve both equations. This intersection point represents the solution to the system of equations.

Definition: Simultaneous equations are two or more equations with the same variables that must be satisfied at the same time. The solution is the point where all equations are true.

When working with linear equations in the form y = mx + c, we need to:

  1. Rearrange each equation into slope-intercept form
  2. Plot each line carefully using the y-intercept and gradient
  3. Find the coordinates of the intersection point
  4. Verify the solution by substituting back into both original equations

Example: Consider the equations y = 2x + 1 and y = x + 5 The intersection point can be found by plotting both lines and reading the coordinates where they meet.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Advanced Techniques in Graphical Solutions

Understanding different graphical solution approaches for simultaneous equations requires mastery of various plotting methods. The gradient-intercept method is particularly useful when equations are already in y = mx + c form, while the cover-up method can help verify solutions quickly.

Highlight: Always check your graphical solution by substituting the coordinates back into both original equations to verify accuracy.

When dealing with more complex systems, careful attention must be paid to:

  • Choosing appropriate scale for axes
  • Extending lines sufficiently to show intersection
  • Using precise plotting techniques
  • Considering the possibility of parallel lines (no solution) or coincident lines (infinite solutions)

The graphical method becomes especially powerful when dealing with non-linear equations, as it can reveal multiple solutions that might be difficult to find algebraically.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Practical Applications of Graphical Solutions

The ability to solve equations graphically connects to many real-world applications in science, engineering, and economics. For instance, finding the break-even point in business occurs where cost and revenue lines intersect.

Vocabulary: Break-even analysis uses simultaneous equations to find where total costs equal total revenue in business calculations.

Understanding graphical solutions helps in:

  • Analyzing supply and demand curves
  • Solving optimization problems
  • Visualizing system behaviors
  • Understanding mathematical modeling

The visual nature of this method helps develop intuition about how equations relate to each other and what their solutions mean in practical contexts.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Common Challenges and Problem-Solving Strategies

Students often encounter specific challenges when working with graphical solutions. These might include difficulty in choosing appropriate scales, accurately plotting points, or interpreting intersection points.

Example: When solving y = 3x - 2 and y = x + 4, careful scaling helps identify the intersection point more accurately.

Key strategies for success include:

  • Using graph paper or grid lines for accuracy
  • Double-checking all plotted points
  • Verifying solutions algebraically
  • Understanding the relationship between slope and y-intercept

Practice with various equation types helps build confidence and proficiency in using graphical methods effectively.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Understanding Methods for Graphically Solving Simultaneous Equations

When learning to solve simultaneous equations graphically, it's essential to understand the fundamental principles and systematic approaches. The graphical method provides a visual way to find solutions where two equations intersect, making abstract concepts more concrete for students.

Definition: Simultaneous equations are two or more equations with the same variables that must be solved together to find values that satisfy all equations simultaneously.

The first step in graphical solutions involves rearranging each equation into slope-intercept form (y = mx + b). This transformation allows us to easily plot the lines on a coordinate plane. For example, when working with equations like 2x + 5y = 16 and 2x + 3y = 8, we first isolate y in each equation.

Example: Converting 2x + 5y = 16 to slope-intercept form: 5y = -2x + 16 y = (-2/5)x + 16/5

Understanding scale and plotting points accurately is crucial for finding precise solutions. When drawing graphs for graphical solution approaches for simultaneous equations, use appropriate scales on both axes and plot several points for each line to ensure accuracy.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Advanced Techniques in Graphical Solutions

The intersection point of the lines represents the solution to the system of equations. This point's coordinates (x, y) satisfy both original equations. When working with more complex equations, careful attention to detail becomes even more critical.

Highlight: Always verify your graphical solution by substituting the coordinates back into both original equations.

Students should practice identifying special cases where lines might be parallel (no solution) or coincident (infinite solutions). These scenarios help develop a deeper understanding of the relationship between algebraic and geometric representations of equations.

The graphical method particularly shines when dealing with real-world applications, such as analyzing break-even points in business or determining optimal solutions in physics problems.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Practical Applications and Problem-Solving Strategies

When creating study notes for solving simultaneous equations graphically, focus on developing a systematic approach. Start with simpler equations to build confidence before progressing to more challenging problems.

Vocabulary: Key terms to master include:

  • Intersection point
  • Slope-intercept form
  • Linear equations
  • Coordinate plane

Real-world applications help reinforce the practical value of these skills. For instance, economists use graphical solutions to analyze supply and demand curves, while engineers apply them to optimize resource allocation.

Consider using technology tools like graphing calculators or software to verify solutions and explore how changing coefficients affects the intersection points.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Mastering Graphical Solutions Through Practice

Developing proficiency in graphical solutions requires regular practice with varied equation types. Start with equations having integer coefficients before moving to fractional or decimal values.

Example: Solve graphically: 3x + y = 9 2x - y = 1

Remember to:

  1. Plot points carefully
  2. Use consistent scales
  3. Draw straight lines accurately
  4. Mark the intersection point clearly

Understanding the connection between algebraic and graphical methods strengthens overall mathematical comprehension. When students can move fluently between these representations, they develop deeper insight into mathematical relationships and problem-solving strategies.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Understanding Graphical Solutions for Simultaneous Equations

When learning to solve simultaneous equations graphically, it's essential to understand the step-by-step process and visualization techniques. The graphical method provides a visual way to find where two equations intersect, giving us the solution that satisfies both equations simultaneously.

Definition: Simultaneous equations are two or more equations that share the same variables and must be solved together to find values that satisfy all equations at once.

The first step in methods for graphically solving simultaneous equations involves rearranging each equation into slope-intercept form (y = mx + b). This transformation makes it easier to plot the lines on a coordinate plane. For example, when solving the equations 2x + 2y = 12 and 3x - 3y = 9, we first rearrange them to y = -x + 6 and y = x - 3 respectively.

Once the equations are properly arranged, we plot both lines on the same coordinate grid. The intersection point of these lines represents the solution to the system. In our example, plotting both equations reveals they intersect at the point (4.5, 1.5), meaning x = 4.5 and y = 1.5 satisfy both original equations.

Example: To verify our graphical solution approaches for simultaneous equations, we can substitute these values back into both original equations: 2(4.5) + 2(1.5) = 12 ✓ 3(4.5) - 3(1.5) = 9 ✓

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

View

Advanced Techniques in Graphical Solutions

Understanding the relationship between algebraic and graphical representations helps develop a deeper comprehension of simultaneous equations. When working with these systems, it's crucial to recognize that parallel lines indicate no solution, while coincident lines suggest infinite solutions.

Highlight: The graphical method is particularly useful for visualizing how changing coefficients affects the solution. It helps students understand why some systems have one solution, no solution, or infinitely many solutions.

Real-world applications of graphical solutions appear in various fields, including economics (supply and demand curves), physics (motion problems), and engineering (optimization problems). For instance, businesses use these methods to determine break-even points where cost and revenue lines intersect.

When working with more complex systems, accuracy in plotting becomes increasingly important. Using technology like graphing calculators or computer software can help achieve more precise results, especially when dealing with decimal values or fractions.

Vocabulary: Key terms to remember:

  • Intersection point: The point where two lines cross, representing the solution
  • Slope-intercept form: y = mx + b, where m is the slope and b is the y-intercept
  • Parallel lines: Lines with the same slope that never intersect
  • Coincident lines: Lines that overlap completely

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Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

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Knowunity is the #1 education app in five European countries

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Subjects

/

Maths

/

Algebra

/

Algebraic formulae

Easy Study Notes: Solve Simultaneous Equations Graphically

user profile picture

laila

@la1la

·

9 Followers

Follow

Learning to solve simultaneous equations graphically requires understanding how to plot lines and find their intersection points.

The key concepts involve:

  • Plotting two or more equations on the same coordinate plane
  • Finding the point(s) where the lines intersect
  • Interpreting the intersection point as the solution that satisfies both equations
  • Understanding when equations have one solution, no solution, or infinite solutions

When exploring methods for graphically solving simultaneous equations, students first need to rearrange each equation into slope-intercept form (y = mx + b). This makes it easier to plot the lines by identifying the slope (m) and y-intercept (b). After plotting both lines carefully with proper scaling, the intersection point represents the x and y values that make both equations true simultaneously. This visual approach helps students better understand the relationship between the equations and their solutions.

Graphical solution approaches for simultaneous equations also reveal important mathematical concepts about the nature of solutions. When lines intersect at exactly one point, the system has a unique solution. Parallel lines never intersect, indicating no solution exists. When lines are identical and overlap completely, the system has infinitely many solutions. This visual representation makes it easier for students to grasp these abstract concepts compared to purely algebraic methods. Additionally, graphing helps verify solutions found through other methods like substitution or elimination, providing a valuable way to check work and deepen understanding of how simultaneous equations behave. The graphical method is particularly useful when dealing with linear equations, though it can be less precise than algebraic methods due to limitations in measurement and scaling accuracy.

13/08/2023

421

 

11/10

 

Maths

2

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

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Understanding Graphical Solutions for Simultaneous Equations

When learning to solve simultaneous equations graphically, students need to understand the fundamental concepts and visualization techniques. The graphical method provides a visual way to find where two equations intersect, giving us the solution that satisfies both equations simultaneously.

The first step in methods for graphically solving simultaneous equations involves plotting both equations on the same coordinate grid. Each equation represents a line, and where these lines intersect gives us the x and y coordinates that solve both equations. This intersection point represents the solution to the system of equations.

Definition: Simultaneous equations are two or more equations with the same variables that must be satisfied at the same time. The solution is the point where all equations are true.

When working with linear equations in the form y = mx + c, we need to:

  1. Rearrange each equation into slope-intercept form
  2. Plot each line carefully using the y-intercept and gradient
  3. Find the coordinates of the intersection point
  4. Verify the solution by substituting back into both original equations

Example: Consider the equations y = 2x + 1 and y = x + 5 The intersection point can be found by plotting both lines and reading the coordinates where they meet.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Advanced Techniques in Graphical Solutions

Understanding different graphical solution approaches for simultaneous equations requires mastery of various plotting methods. The gradient-intercept method is particularly useful when equations are already in y = mx + c form, while the cover-up method can help verify solutions quickly.

Highlight: Always check your graphical solution by substituting the coordinates back into both original equations to verify accuracy.

When dealing with more complex systems, careful attention must be paid to:

  • Choosing appropriate scale for axes
  • Extending lines sufficiently to show intersection
  • Using precise plotting techniques
  • Considering the possibility of parallel lines (no solution) or coincident lines (infinite solutions)

The graphical method becomes especially powerful when dealing with non-linear equations, as it can reveal multiple solutions that might be difficult to find algebraically.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Practical Applications of Graphical Solutions

The ability to solve equations graphically connects to many real-world applications in science, engineering, and economics. For instance, finding the break-even point in business occurs where cost and revenue lines intersect.

Vocabulary: Break-even analysis uses simultaneous equations to find where total costs equal total revenue in business calculations.

Understanding graphical solutions helps in:

  • Analyzing supply and demand curves
  • Solving optimization problems
  • Visualizing system behaviors
  • Understanding mathematical modeling

The visual nature of this method helps develop intuition about how equations relate to each other and what their solutions mean in practical contexts.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Common Challenges and Problem-Solving Strategies

Students often encounter specific challenges when working with graphical solutions. These might include difficulty in choosing appropriate scales, accurately plotting points, or interpreting intersection points.

Example: When solving y = 3x - 2 and y = x + 4, careful scaling helps identify the intersection point more accurately.

Key strategies for success include:

  • Using graph paper or grid lines for accuracy
  • Double-checking all plotted points
  • Verifying solutions algebraically
  • Understanding the relationship between slope and y-intercept

Practice with various equation types helps build confidence and proficiency in using graphical methods effectively.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding Methods for Graphically Solving Simultaneous Equations

When learning to solve simultaneous equations graphically, it's essential to understand the fundamental principles and systematic approaches. The graphical method provides a visual way to find solutions where two equations intersect, making abstract concepts more concrete for students.

Definition: Simultaneous equations are two or more equations with the same variables that must be solved together to find values that satisfy all equations simultaneously.

The first step in graphical solutions involves rearranging each equation into slope-intercept form (y = mx + b). This transformation allows us to easily plot the lines on a coordinate plane. For example, when working with equations like 2x + 5y = 16 and 2x + 3y = 8, we first isolate y in each equation.

Example: Converting 2x + 5y = 16 to slope-intercept form: 5y = -2x + 16 y = (-2/5)x + 16/5

Understanding scale and plotting points accurately is crucial for finding precise solutions. When drawing graphs for graphical solution approaches for simultaneous equations, use appropriate scales on both axes and plot several points for each line to ensure accuracy.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Advanced Techniques in Graphical Solutions

The intersection point of the lines represents the solution to the system of equations. This point's coordinates (x, y) satisfy both original equations. When working with more complex equations, careful attention to detail becomes even more critical.

Highlight: Always verify your graphical solution by substituting the coordinates back into both original equations.

Students should practice identifying special cases where lines might be parallel (no solution) or coincident (infinite solutions). These scenarios help develop a deeper understanding of the relationship between algebraic and geometric representations of equations.

The graphical method particularly shines when dealing with real-world applications, such as analyzing break-even points in business or determining optimal solutions in physics problems.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Practical Applications and Problem-Solving Strategies

When creating study notes for solving simultaneous equations graphically, focus on developing a systematic approach. Start with simpler equations to build confidence before progressing to more challenging problems.

Vocabulary: Key terms to master include:

  • Intersection point
  • Slope-intercept form
  • Linear equations
  • Coordinate plane

Real-world applications help reinforce the practical value of these skills. For instance, economists use graphical solutions to analyze supply and demand curves, while engineers apply them to optimize resource allocation.

Consider using technology tools like graphing calculators or software to verify solutions and explore how changing coefficients affects the intersection points.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Mastering Graphical Solutions Through Practice

Developing proficiency in graphical solutions requires regular practice with varied equation types. Start with equations having integer coefficients before moving to fractional or decimal values.

Example: Solve graphically: 3x + y = 9 2x - y = 1

Remember to:

  1. Plot points carefully
  2. Use consistent scales
  3. Draw straight lines accurately
  4. Mark the intersection point clearly

Understanding the connection between algebraic and graphical methods strengthens overall mathematical comprehension. When students can move fluently between these representations, they develop deeper insight into mathematical relationships and problem-solving strategies.

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding Graphical Solutions for Simultaneous Equations

When learning to solve simultaneous equations graphically, it's essential to understand the step-by-step process and visualization techniques. The graphical method provides a visual way to find where two equations intersect, giving us the solution that satisfies both equations simultaneously.

Definition: Simultaneous equations are two or more equations that share the same variables and must be solved together to find values that satisfy all equations at once.

The first step in methods for graphically solving simultaneous equations involves rearranging each equation into slope-intercept form (y = mx + b). This transformation makes it easier to plot the lines on a coordinate plane. For example, when solving the equations 2x + 2y = 12 and 3x - 3y = 9, we first rearrange them to y = -x + 6 and y = x - 3 respectively.

Once the equations are properly arranged, we plot both lines on the same coordinate grid. The intersection point of these lines represents the solution to the system. In our example, plotting both equations reveals they intersect at the point (4.5, 1.5), meaning x = 4.5 and y = 1.5 satisfy both original equations.

Example: To verify our graphical solution approaches for simultaneous equations, we can substitute these values back into both original equations: 2(4.5) + 2(1.5) = 12 ✓ 3(4.5) - 3(1.5) = 9 ✓

6/10/22 LO: to be able to solve simultaneousing equations graphically cover up method=x+y=7 10 9 8 7 6 5 4 3 2 y=x-3 y=x-3 Sisic check in y=

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Advanced Techniques in Graphical Solutions

Understanding the relationship between algebraic and graphical representations helps develop a deeper comprehension of simultaneous equations. When working with these systems, it's crucial to recognize that parallel lines indicate no solution, while coincident lines suggest infinite solutions.

Highlight: The graphical method is particularly useful for visualizing how changing coefficients affects the solution. It helps students understand why some systems have one solution, no solution, or infinitely many solutions.

Real-world applications of graphical solutions appear in various fields, including economics (supply and demand curves), physics (motion problems), and engineering (optimization problems). For instance, businesses use these methods to determine break-even points where cost and revenue lines intersect.

When working with more complex systems, accuracy in plotting becomes increasingly important. Using technology like graphing calculators or computer software can help achieve more precise results, especially when dealing with decimal values or fractions.

Vocabulary: Key terms to remember:

  • Intersection point: The point where two lines cross, representing the solution
  • Slope-intercept form: y = mx + b, where m is the slope and b is the y-intercept
  • Parallel lines: Lines with the same slope that never intersect
  • Coincident lines: Lines that overlap completely

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Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the #1 education app in five European countries

4.9+

Average app rating

15 M

Pupils love Knowunity

#1

In education app charts in 12 countries

950 K+

Students have uploaded notes

Still not convinced? See what other students are saying...

iOS User

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

Philip, iOS User

The app is very simple and well designed. So far I have always found everything I was looking for :D

Lena, iOS user

I love this app ❤️ I actually use it every time I study.