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f(2): 2p+q=3
_______________ -
-3p = -12
p = 4
f(-1): (4)(-1)+q= -9
-4+q= -9
q=-5
f(x)= 4x-5
F(-1) = -p + q
-9 = -p + q
f(x) = px + q
f(2) = 2p + q
3 = 2p +q
2p + q = 3
-p + q = -9
------------------ -
3p = 12
p = 4
2p + q =3
2×4 + q = 3
8 + q = 3
q = -5
rumus ⇒ f(x) = px + q ⇒ f(x) = 4x -5