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tegak lurus = m1×m2 =-1
m= x/y
y-y1= m(x-x1)
m1= 2y=3x-12= 2/3
2/3×m2=-1
m2= -3/2
y-(-1)= -3/2(x-6)
y+1= -3/2x + 18/2
(y+1= -3/2x+18/2)×2 (biar penyebutnya hilang(
2y+2= -3x + 18
2y=-3x+18-2
2y= -3x +16