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(2,-1) berarti
-1 = p(2) + q
2p + q = -1
(-2,11) berarti
11 = p(-2) + q
-2p + q = 11
eliminasi keduanya
4p = -12
p = -3
substitusi p ke salah satu persamaan
2p + q = -1
2(-3) + q = -1
-6 + q = -1
q = 5
semoga bisa dipahami ;-)