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(p,-3) → -3=pa+b
(-3,q) → q=-3a+b
(2,-2) → -2=2a+b
(-2,6) → 6=-2a+b
-2=2a+b
6=-2a+b
_______-
-8=4a → a=-2
a kita substitusikan ke persamaan -2=2a+b → -2=2(-2)+b → -2=-4+b → -2+4=b → b=2
-3=pa+b → -3=2p+2 → 2p=-5 → p=-5/2
q=-3a+b → q=-3(-2)+2 → q=6+2 → q=8
Jadi, p=-5/2 dan q=8. Untuk r tidak ada.
Semangat!