Mathsercise-C Ready? Equations 2 Here we go!.

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Presentation transcript:

Mathsercise-C Ready? Equations 2 Here we go!

Notice that the sign changes when you change sides Solve the equation… Question 2 4x – 9 = 13 + 9 4x = 22 x = 5.5 Answer 1 Equations 2

Notice that the sign changes when you change sides Solve the equation….. Question 3 15r -7r – 4 = 7r + 12 + 4 8r = 16 Answer r = 2 2 Equations 2

3 Solve the equation… 6 – 5x + 12 = 2(2x – 6) 4x + 5x – 12 18 = 9x Expand the brackets first Solve the equation… Question 4 6 – 5x + 12 = 2(2x – 6) 4x + 5x – 12 These are identical – just written the other way round! 18 = 9x Answer 9x = 18 x = 2 3 Equations 2

4 Solve this simultaneous equation 3x + 9y = 39 x + 3y = 13 (x3) Multiply the first equation by 3 to make the x values the same Start 3x + 9y = 39 x + 3y = 13 (x3) 3x + 2y = 4 Now subtract (there are no x’s left then!) Answer 7y = 35 Now substitute y=5 into the first equation y = 5 x + 3(5) = 13 4 x = -2 Equations 2