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x+2y=0 ⇒ x=-2y
1/2*(-2y)-2y=-3
-y-2y=-3
-3y=-3
y=1
x=-2
===========
y=-1/2x
x -2 0 2
y 1 0 -1
y=1/4x+3/2
x -2 0 2
y 1 3/2 2
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