tlong bantu dengan caranya

Bab Fungsi

14.)
f(x) = -5x + 2
f(5)= -5(5) + 2 = -25 + 2 = -23

f(-5) = -5(-5) + 2 = 25 + 2 = 27

Jawaban = -23 dan 27 (B )

15.)f(x) = ax + b

f(3) = 2
2 = 3a + b

f(-2) = -8
-8 = -2a + b

3a + b = 2
-2a + b = -8
_________ _
5a = 10
a = 2

3a + b = 2
3(2) + b = 2
6 + b = 2
b = -4

f(x) = ax + b
f(x) = 2x - 4 (D )