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garis =-2x-y+6
gradien=2/-1=-2
karena tegak lurus
m1.m2=-1
-2.m2=-1
m2=1/2
lalu
(y-y1)=m(x-x1)
y+2=1/2(x-4)
2y+4=x-4
x-2y-8=0(jawabannya)