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tegak lurus, maka 3/2xm2=-1⇒m2=-2/3
pers garis baru: y-(-7)=-2/3(x-6)⇒y+7=-(2/3)x+4⇒y=-(2/3)x-3⇒3y=-2x-9
misal m1 dicari dari 8y-12×=15
8y= 12x+15
y= 12/8 × +15/8
y= 12/8
m1= 3/2
m1.m2=-1
m2= -1 / (3/2)
= -2/3
y-y1= m (×-×1)
y - (-7) = -2/3 (×-6)
y+7 = -2/3 (×-6)
3( y+7) = -2 (×-6)
3y +21 = -2× + 12
3y= -2× +12 -21
3y = -2× -9
3y + 2x = -9