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maka
f(3) = 12 ⇒ 3a + b = 12
f(2) = 9 ⇒ 2a + b = 9
Sehiggga
3a + b = 12
2a + b = 9 -
a = 3
dan
2a + b = 9
⇒ 2(3) + b = 9
⇒ 6 + b = 9
⇒ b = 3
maka
f(x) = 3x + 3
Sehingga
f(-3) = 3(-3) + 3
⇒ f(-3) = -9 + 3
⇒ f(-3) = -6
Terimakasih semoga membantu