Mohon di jawab No. 15 Besok di kumpul

f(-5) = a(-5) + b = -16
f (3) = a(3) + b = 8
-5a + b = -16
3a + b = 8
_________ _
-8a. = -24
a = 3
-5a + b = -16
-5(3) + b = -16
-15 + b = -16
b = -1
maka f(4) adalah
f(4) = ax + b
= 3(4) + (-1)
= 12 - 1
= 11
jawabannya c