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mL1 = (-1 - 8)/(3 -(-1))
mL1 = (-9)/4
mL2 = (-9-(-3))/(1-(-2))
mL2 = -6/3
mL1 x mL2 ≠ -1
mL1 ≠ mL2
garis L1 dan L2 tidak ada hubungan sama sekali antara keduanya