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Persamaan 2: qx + 4y = 4
Kedua garis saling tegak lurus maka
⇨ m1× m2 = -1
⇨ [-(-3)/p] × (-q/4) = -1
⇨ (3/p)×(-q/4) = -1
⇨ (-3q/4p) = -1
⇨ -3q = -4p
⇨ 3q = 4p
Atau
p : q = 3 : 4