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karena tegak lurus maka m1.m2=-1
maka m2=3
y-y1=m(x-x1)
y-2=3(x-3)
y-2=3x-9
jadi persamaannya 3x-y=7
P(3,2)
y-y1=m(x-x1)
y-2=-1/3x+1 x3
3y-6=-x+3
3y+x=9