subtract x from both sides
divide each term by 2.
y=-1/2 x+6
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4y+4 = 2y+12 4y-2y = 12-4 2y = 8 y = 4
-2
Both of them are equations!The solution is (x, y) = (2, 1).
2x+y=-12-4x-2y=30 x=-y/2+30, you plug this into -12-4x-2y=30 and get -12+2y-120-2y=30 which gives 2y-2y=162. This is not possible, so the equation is unsolvable.
4