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b. x = -5 → f(x) = 11
f(5)
= 2(-5) - 1
= -10 - 1
= -11
Jadi, benar bahwa f(-5) = -11.
c. x = a → f(x) = 5
f(a) = 5
⇔ 2a - 1 = 5
⇔ 2a = 5 + 1
⇔ 2a = 6
⇔ a =
⇔ a = 3
Jadi, benar bahwa kalau f(a) = 5, maka a = 3.
d. x = 1 → f(x) = 1
f(1)
= 2(1) - 1
= 2 - 1
= 1
Jadi, benar bahwa f(1) = 1 atau bayangan 1 ialah 1.
Jawaban yang benar : A.
9. Diketahui G(x) = ax + b. Jika G(–2) = –4 dan G(–6) = 12, maka bentuk fungsi G ialah ....
A. G(x) = –4x + 12 C. G(x) = –2x + 6
B. G(x) = –4x – 12 D. G(x) = –4x – 6
Jawaban:
