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f(2) = 2p + q = -11
f(-2) = -2p + q = 1
Eliminasi q :
2p + q = -11
-2p + q = 1 -
4p = -12
p = -12/4
p = -3
Substitusi p = -3 ke persamaan 2p + q = -11 :
2p + q = -11
2(-3) + q = -11
-6 + q = -11
q = -11 + 6
q = -5
f(x) = px + q
f(x) = -3x + (-5)
f(x) = -3x -5