Question

Can someone help me??

Consider the following pair of equations:
y = –2x + 8
y = x – 1

Explain how you will solve the pair of equations by substitution. Show all the steps and write the solution in (x, y) form.

Answer 1

substituting y
–2x + 8 = x – 1

solve this for x

then substitute x back into either of the original equations, to solve for y

Answer 2

So is this correct then??

–2x + 8 = x – 1

+2x +2x

8 = 3x - 1

+1 +1

9 = 3x

3 = x





-2(3) + 8 = 3 - 1

-6 + 8 = 3 - 1

2 = 2

Answer 3

you have found x =3, that's right!

now, to find y : sub x=3 into one of the original equations
(say the second one)

y = (3) – 1
=