Question

Order the steps and justifications in solving the system of linear equations.

Equation 1: -2x+y=7
Equation 2:2x+y=-9

Answer 1

-2x + y = 7

2x + y = -9

First, add the equations together...

2y = -2

Divide by 2 on both sides...

y = -1

Now, plug in -1 for y to find x...

2x + (-1) = -9

Add one on both sides...

2x = -8

Divide by 2 on both sides...

x = -4

Your answers are...

x = -4

y = -1

Hope this helps :)