Diketahui fungsi f (x)= ax + b.Jika f (-1)= -8 dan f(3)=4. Nilai f (5) adalah... A.12 B.10 C.8 D.4 Tolong jawab pake cara ya...dengan benarr. Secepatnyaa jawab.

f(x) = ax + b

f(-1) = -8
-8 = -8a + b ••• (1)

f(3) = 4
4 = 4a + b ••• (2)

-8a + b = -8
4a + b = 4
----------------- -
-12a = -12
a = 1

-4a + b = 4
-4 (1) + b = 4
-4b = 4
b = -1

Maka,
f(5) = 5a + b
f(5) = 5 (1) + (-1)
f(5) = 5 - 1
f(5) = 4
Jawaban : D

jawaban : B. 10
semoga membantu:))