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y-2 / 7-2 = x-0 / -1-0
y-2 /5 = x/-1
-y+2=5x
y=-5x+2
m=-5
karena tegak lurus jadi
m1.m2=-1
m2=-1/-5
m2=1/5
jadi persamaannya
y=1/5x+2