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f(x) = px + q
f(-1) = -5 ⇒ -p + q = -5
f(4) = 5 ⇒ 4p + q = 5
Maka :
4p + q = 5
-p + q = -5
--------------- -
5p = 10
p = 10/5
p = 2
masukan nilai p :
-p + q = -5
-2 + q = -5
q = -5 + 2
q = -3
Jadi, q = -3 dan p = 2
maka :
f(-6) = -6p + q
= -6(2) + (-3)
= -12 - 3
= -15
Semoga membantu :)