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4y=-3+2x
y=-3/4+2x/4
y=-3/4+x/2
-12x-6y=4
-6y=4+12x
6y=-4-12x
y=-4/6-12x/6
y=-4/6-2x
m1xm2=-1 1/2x-2=-1 -1=-1 son perpendiculares