two x minus two y equals negative two.Negative eight x plus two y equals twenty
2x - 2y = -2
-8x + 2y = 20 Add them
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-6x = 18 Solve for x
x = -3
Use the first formula to find y
2*(-3) - 2y = -2
-6 - 2y = -2
-2y = 4
y = -2
Use the second formula to verify the values
-8x + 2y = 20
(-8 * -3) + (2 * -2) = 20
24 + (-4) = 20
20 = 20