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3x-6y+12=0
-6y=-3x-12
y=-3x/-6-12/-6
y=-3/-6
=3/6=1/2
m1=1/2 karena tegak lurus, m2=-2
y-y1=m(x-x1)
y-7=-2(x+2)
y-7=-2x-4
=-2x-y-4+7=0
=-2x-y+3=0