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Anonymous
x = -4 and y = 4
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4y+4 = 2y+12 4y-2y = 12-4 2y = 8 y = 4
4x+2y = 20 2y = -4x+20 y = -2x+10
-2
Add the two equations you get 5y = 60 so y = 12 and x = 2
Both of them are equations!The solution is (x, y) = (2, 1).