Diketahui f(x) = px + q, f(-1) = -8 dan f(3)=12. Nilai f(-3) adalah

Langsung aja y

f(-1) = -p + q = -8
f(3) = 3p + q = 12
____________-
-4p = -20
p = 5

-p + q = -8
q = -8 + 5
q = -3

f(x) = px + q
f(x) = 5x - 3

f(-3) = 5(-3) - 3
f(-3) = -15 - 3
f(-3) = -18

semoga berguna +_+