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g1 tegak lurus g2=m1.m2=-1
m1.(-3/1)=-1
m1=-1: (-3/1)
=-1x(-1/3)
=1/3
y1-y2=m(x-x1)
y-(-18)=1/3 (x-12)
y=1/3x - 12/3 - 18
y=1/3x - 12/3 - 54/3
y=1/3x - 66/3 (x3)
3y= x-66
x-3y-66=0
sorry kalau salah