You can put this solution on YOUR website! X=-y+7
X-y=-9
x+y=7, adding y to both sides of first. Now add the two.
2x=-2, the y s disappear
x=-1 divide by 2 both sides
substitute into first to get y
-1=-y+7; y=8
check (-1,8) in second equation
-1-8=-9. checks.
(-1,8) answer
