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-y=-4x+7
y= 4x-7
m1= 4
karna tegak lurus maka m1.m2=-1
4 . m2 = -1
m2 = -1/4
pers. garis
y-y1 = m(x - x1)
y-5 = -1/4 ( x-(-8)
y-5 = -1/4 (x+8)
4y-20= -x-8
x+4y-12=0
atau
x+4y=12