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y-(-2) / 8-(-2) = x-1/5-1
y+2/8+4 = x-1/4
y+2 / 12 = x-1 / 4
4(y+2) = 12(x-1)
4y + 8 = 12x -12
4y = 12x -12 -8
4y = 12x -20
klo gk salah yaa. lupa2 ingat..