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2p + q =-1 .... (1)
jika f(-3)=14 -> f(-3)=p(-3) + q = 14
-3p+q=14 ....(2)
eliminasi persamaan (1) dan (2)
2p+q=-1
-3p+q=14 -
------------------
5p=-15
p=-3
substitusi ke salah satu persamaan, misalnya (1)
2p+q=-1
2(-3)+q=-1
-6+q=-1
q=-1+6
q=5
jadi nilai p dan q berturut turut -3 dan 5