4x - y =5
4x + 4y = -4
Change all the signs of the first equation
-4x + y = -5
Add 4x to both sides
y == 4x - 5
Substitute for y in second equation
4x + 4(4x - 5) = -4
4x + 16x - 20 = -4
20x - 20 = -4
Add 20 to both sides
20x = 16
Divide both sides by 20
x = 16/20 === 4/5
Substitute to find y
y == 4x - 5 == 4(4/5) - 5 == 16/5 - 5 = -9/5
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