2x+2y=-4 4x-2y=8
Make one of the equation into a slope intercept form (y = mx + b)
2x + 2y = -4
2y = -2x - 4
y = -1x - 4 (Substitute this slope intercept form into the other equation where y is)
4x - 2(-1x - 4) = 8
4x + 2x + 8 = 8
6x + 8 = 8
6x = 0
x = 0 (Place this answer in the 2x + 2y = 10, where x is).
2(0) + 2y = 10
2y = 10
y = 5
Your solution set (meaning x and y) is (0,5)