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2x - y = 8
y = 2x - 8 sehingga m1=2
agar tegak lurus m1 x m2 = -1 maka
2 x m2 =-1
m2= -2
jd pers garisnya adl
y-y1=m2(x-x1)
y-7= -2(x-0)
y = -2x + 7
pers garisx adalah y-7=-1/2(x-0) y-7=-1/2x y=-1/2x+7