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3y = -x+6
y = -1/3 x +6
m1= -1/3 karena tegak lurus, maka m2 = 3
melalui titik (-4,-2) dengan m=3
y-y1 = m (x-x1)
y +2 = 3(x+4)
y+2= 3x+12
y = 3x +10