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Tegak lurus
m1=-2/3
m2=3/2
Syarat=
-2/3x3/2=-6/6=-1
melalui(5,-3)
Y-y1=m(X-x1)
Y-(-3)=3/2(X-5)
Y+3=3/2X-15/2
Y=3/2X-15/2-3
Y=3/2X-15/2-6/2
Y=3/2X-21/2
------------------ x 2
2Y=3X-21
-3X+2Y+21=0
3X-2Y-21=0
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