-4x + 2y = 8
add 4x to both-side of the equation
-4x + 4x + 2y = 8 + 4x
2y = 8 + 4x (additive property)
divide through the equation by 2
2y/2 = 8/2 + 4x/2
y = 4 + 2x (division property)
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