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Tegak lurus
y+2x-7=0
2x+y-7=0
m1=-a/b=-2/1=-2
m2=1/2
syarat=
m1xm2=-1
Melalui (4,-3)
Y-y1=m(X-x1)
Y-(-3)=1/2(X-4)
Y+3=1/2X-2
Y=1/2X-2-3
Y=1/2X-5
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2Y=X-10
-X+2Y+10=0
X-2Y-10=0
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