Question

2x + y = -2

x + y = 5
 The x-coordinate of the solution to the system shown is _____.
 -7
-3
3
7

Answer 1

-7

Explanation:

Answer 2

Subtract equation (2) from equation (1)
Subtract the like terms (ie subtract straight down)

2x - x = 1x = x
y - y = 0y = 0 so the y terms go away
-2 - 5 = -7

We end up with x = -7