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🤍 similtaneous equations (basics) 🤍
13/09/2023
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Thursday 11th if x = 4 what the value of these se a) x + 3 = 7 b) 2x = 8 fx²=16 May 2023 e) 4x=5 = 11 d) 10-*=4 G) 3x² =18x3=98 H) 2x² + 3x = Gc + 2+ = 14 2c + 2+ = 6 С Substitution I order two coffes and one tea, but don't know the price, the total for my order is €1.40 2c+T=1.40 so coffee could cost sop and tea could cost 40p but there is so many different combinations so But then we find out 3c+T=f1.70 so what we do is put It in a column and find the difference: 3c+T=170 T-J so this now tells us that coffee is 30p -> you also need to use substitution when doing this. 20+ 2c + T = 140 CO=30 = 2 find the difference between the simultaneous equations 2 work out x² work out the value of the letter Substitute the number into the equation. (now you can just solve the equation practise 3g + 3b = 18 12g+ 3h = 14 g ❤ Simultaneos equations = 4√ ) (6×2) + 2€ = 14 12 + 24 =14 -12 -12 26 = 2 42 > 20-4x² = 4 32 + 12 = 44 : 2 (3x4) + 3h = 18/ 12 + 3h = 18+ -12 -1²3h=6 +3 3 H=2✓ EXAMPLE 6=1 ♡ 12+6=18/ Tuesday 1) 4 x-5 = 20 2)-3x - 2 = 6 / 3) - 1 x - 6 =...
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Alternative transcript:
6 47-8x-3 = 24 5)-9x-5 45 6) -8 x -12 = 96/7) - 7 x -10= 70° 8)-3x - 15:45 A When are the same it's positive Sx05 = 25 because they and di wading, numbers the e When multiplying and dividing negative numbers if the signs are different, your answer would be negative - 5x5=-25 Sometimes when you do simultaneous equations you have to add and not - 9x - 4y = 19. Because the signs are different if we do -4 + 4 = 0 if we did -4+4 = -8 and that wouldn't get ridoty! (43 44y=20 13x= 39 then you would Just substitute like normal JC = 16th May 2023 • Simultaneous equations 3 Work out these a) 4x + 2y = 10 2 + 2y = 17 3x = 3 x : 1 ✓ c) bx-3y -12 4x-3y=2 2x = 10 x=5/ E) 8x + 7y=39_ 8x + 2y = 34 =5 simultaneous equations *1 + 2y = 7 -) 2y = 6 y = 3/ 20-3y = 2 + 3y +3y 20 = 2 + 3y 42 18 = 34 61 b) 2x +y = 36² +30 + y = 36 -30 x=y=9 y = 67 3x = 45 15/ 0) 3ac-6 y = 6 2x-by = 3 = 3/ 9=6₂y=6 +64 9² ay 16 +by (