Subjects

Maths

Algebra

Straight line graphs

Y = mx + c

Learn y=mx+c: Simple Guide to Straight Line Graphs for Kids

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Learn y=mx+c: Simple Guide to Straight Line Graphs for Kids

Studynotes_gcse

@studynotes_gcse

891 Followers

The equation of a straight line is a fundamental concept in mathematics, particularly in algebra and coordinate geometry. It allows us to describe and analyze linear relationships graphically and algebraically. The general form of a straight line equation is y=mx+c, where m represents the gradient (slope) and c is the y-intercept.

• Understanding the equation of a straight line is crucial for solving various mathematical problems and real-world applications.
• Key components include gradient calculation, y-intercept determination, and using the point-slope form to derive equations.
• The ability to interpret and manipulate linear equations is essential for success in GCSE maths and beyond.

27/06/2022

674

Equation of a straight line
1.
Equation of a straight line
General form: y = mx + ₁ c
↓
gradient
e.g.
Example
2y + 4 = 8x
2y = 8x-4
Y = 4x-2

Finding the Equation of a Straight Line

To find the equation of a straight line with one point and a given gradient, follow these steps:

Use the point-slope form: y - y₁ = m(x - x₁)
Substitute the known values for the point (x₁, y₁) and the gradient (m)
Simplify and rearrange to get the equation in the form y = mx + c

Example: Find the equation of a line with gradient 6 passing through point (2, 7): y - 7 = 6(x - 2) y = 6x - 12 + 7 y = 6x - 5

This method is particularly useful for solving exam style questions on straight line equations GCSE maths.

Vocabulary: The y-intercept is the point where a line crosses the y-axis, represented by the 'c' in the equation y = mx + c.

Understanding these concepts is crucial for tackling equation of a straight line questions and answers PDF resources and straight line graphs corbettmaths exercises.

View

Equation of a Straight Line: Basics and Gradient

The equation of a straight line is typically expressed in the general form y = mx + c, where:

m represents the gradient (slope) of the line
c represents the y-intercept (where the line crosses the y-axis)

Definition: The gradient of a line is the measure of its steepness, calculated as the ratio of vertical change to horizontal change between two points on the line.

The gradient can be calculated using three equivalent methods:

Using the formula: m = (y₂ - y₁) / (x₂ - x₁)
Counting squares on a graph: vertical change / horizontal change
Rise over run method

Example: To find the gradient between points (2, 3) and (5, 7): m = (7 - 3) / (5 - 2) = 4 / 3

Highlight: The gradient is a crucial component in the equation of a straight line given two points.

Understanding these concepts is essential for solving equation of a line questions and mastering straight line graph equations.

View

Deriving Equations from Graphs and Points

To find the equation of a straight line from a graph:

Choose two points on the line
Calculate the gradient using m = (y₂ - y₁) / (x₂ - x₁)
Determine the y-intercept by observing where the line crosses the y-axis
Substitute these values into y = mx + c

Example: For a line passing through (1, 5) and (-2, -1): m = (5 - (-1)) / (1 - (-2)) = 6 / 3 = 2 y-intercept (c) = 3 Equation: y = 2x + 3

This process is essential for solving equations of linear graphs maths genie answers and similar problems.

To find the equation from two given points:

Calculate the gradient using the two points
Use the point-slope form: y - y₁ = m(x - x₁)
Simplify to get the final equation

Highlight: The formula for gradient of a line with two points is crucial for solving these types of problems.

These skills are frequently tested in equation of a line GCSE questions and answers.

View

Review and Exam-Style Questions

This section presents various exam-style questions to test understanding of straight line graph equations:

Identifying equations of lines from graphs
Determining which lines pass through specific points
Finding equations of lines given gradient and a point
Verifying if multiple points lie on the same straight line

Example: To check if points (1, 4), (4, 10), and (9, 20) lie on a straight line:

Calculate gradient between two pairs of points

If gradients are equal, points are collinear

Verify by substituting into the derived equation

These types of questions are common in exam style questions on straight line equations GCSE pdf materials.

Highlight: Practicing these diverse question types is essential for mastering the equation of a straight line concept and excelling in GCSE maths exams.

Understanding how to approach these varied question types is crucial for success in maths genie equation of a line answers and similar assessments.

View

Advanced Equation Forms and Problem-Solving

Sometimes, you may need to express the equation in the form ax + by + c = 0, where a, b, and c are integers. This involves:

Finding the equation using the point-slope form
Rearranging terms to get all variables on one side
Multiplying all terms by a common factor to eliminate fractions

Example: For points (3, 1) and (15, 9), the equation becomes: 2x - 3y + 3 = 0

This form is often required in more advanced equation of a straight line questions and answers PDF resources.

Vocabulary: The general form ax + by + c = 0 is sometimes called the standard form of a linear equation.

Understanding these advanced forms is crucial for tackling complex CORBETTMATHS equation of a Line exam Style Questions answers.

View

Can't find what you're looking for? Explore other subjects.

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.

Download in

Google Play

Download in

App Store

Knowunity is the #1 education app in five European countries

4.9+

Average app rating

13 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.

Subjects

Maths

Algebra

Straight line graphs

Y = mx + c

Learn y=mx+c: Simple Guide to Straight Line Graphs for Kids

Studynotes_gcse

@studynotes_gcse

891 Followers

27/06/2022

674

10/11

Maths

Finding the Equation of a Straight Line

To find the equation of a straight line with one point and a given gradient, follow these steps:

Use the point-slope form: y - y₁ = m(x - x₁)
Substitute the known values for the point (x₁, y₁) and the gradient (m)
Simplify and rearrange to get the equation in the form y = mx + c

Example: Find the equation of a line with gradient 6 passing through point (2, 7): y - 7 = 6(x - 2) y = 6x - 12 + 7 y = 6x - 5

This method is particularly useful for solving exam style questions on straight line equations GCSE maths.

Vocabulary: The y-intercept is the point where a line crosses the y-axis, represented by the 'c' in the equation y = mx + c.

Understanding these concepts is crucial for tackling equation of a straight line questions and answers PDF resources and straight line graphs corbettmaths exercises.

Equation of a Straight Line: Basics and Gradient

The equation of a straight line is typically expressed in the general form y = mx + c, where:

m represents the gradient (slope) of the line
c represents the y-intercept (where the line crosses the y-axis)

Definition: The gradient of a line is the measure of its steepness, calculated as the ratio of vertical change to horizontal change between two points on the line.

The gradient can be calculated using three equivalent methods:

Using the formula: m = (y₂ - y₁) / (x₂ - x₁)
Counting squares on a graph: vertical change / horizontal change
Rise over run method

Example: To find the gradient between points (2, 3) and (5, 7): m = (7 - 3) / (5 - 2) = 4 / 3

Highlight: The gradient is a crucial component in the equation of a straight line given two points.

Understanding these concepts is essential for solving equation of a line questions and mastering straight line graph equations.

Deriving Equations from Graphs and Points

To find the equation of a straight line from a graph:

Choose two points on the line
Calculate the gradient using m = (y₂ - y₁) / (x₂ - x₁)
Determine the y-intercept by observing where the line crosses the y-axis
Substitute these values into y = mx + c

Example: For a line passing through (1, 5) and (-2, -1): m = (5 - (-1)) / (1 - (-2)) = 6 / 3 = 2 y-intercept (c) = 3 Equation: y = 2x + 3

This process is essential for solving equations of linear graphs maths genie answers and similar problems.

To find the equation from two given points:

Calculate the gradient using the two points
Use the point-slope form: y - y₁ = m(x - x₁)
Simplify to get the final equation

Highlight: The formula for gradient of a line with two points is crucial for solving these types of problems.

These skills are frequently tested in equation of a line GCSE questions and answers.

Review and Exam-Style Questions

This section presents various exam-style questions to test understanding of straight line graph equations:

Identifying equations of lines from graphs
Determining which lines pass through specific points
Finding equations of lines given gradient and a point
Verifying if multiple points lie on the same straight line

Example: To check if points (1, 4), (4, 10), and (9, 20) lie on a straight line:

Calculate gradient between two pairs of points

If gradients are equal, points are collinear

Verify by substituting into the derived equation

These types of questions are common in exam style questions on straight line equations GCSE pdf materials.

Highlight: Practicing these diverse question types is essential for mastering the equation of a straight line concept and excelling in GCSE maths exams.

Understanding how to approach these varied question types is crucial for success in maths genie equation of a line answers and similar assessments.

Advanced Equation Forms and Problem-Solving

Sometimes, you may need to express the equation in the form ax + by + c = 0, where a, b, and c are integers. This involves:

Finding the equation using the point-slope form
Rearranging terms to get all variables on one side
Multiplying all terms by a common factor to eliminate fractions

Example: For points (3, 1) and (15, 9), the equation becomes: 2x - 3y + 3 = 0

This form is often required in more advanced equation of a straight line questions and answers PDF resources.

Vocabulary: The general form ax + by + c = 0 is sometimes called the standard form of a linear equation.

Understanding these advanced forms is crucial for tackling complex CORBETTMATHS equation of a Line exam Style Questions answers.

Can't find what you're looking for? Explore other subjects.

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.

Download in

Google Play

Download in

App Store

4.9+

Average app rating

13 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

Learn y=mx+c: Simple Guide to Straight Line Graphs for Kids

Finding the Equation of a Straight Line

Equation of a Straight Line: Basics and Gradient

Deriving Equations from Graphs and Points

Review and Exam-Style Questions

Advanced Equation Forms and Problem-Solving

Similar content

Can't find what you're looking for? Explore other subjects.

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.

4.9+

13 M

#1

950 K+

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

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

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

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

Learn y=mx+c: Simple Guide to Straight Line Graphs for Kids

Finding the Equation of a Straight Line

Equation of a Straight Line: Basics and Gradient

Deriving Equations from Graphs and Points

Review and Exam-Style Questions

Advanced Equation Forms and Problem-Solving

Similar content

Can't find what you're looking for? Explore other subjects.

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.

4.9+

13 M

#1

950 K+

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

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

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

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