Question

Diket = fungsi f (x) = Ax + b
jika f (4) = 5 dan f(-2) = -7

tentukan a. nilai a dan b
b. persamaan fungsi
c. nilai f (3)

Answer 1

A)
f(x) = ax + b
f(4) = 4a + b = 5
f(-2) = -2a + b = -7
____________ _
6a = 12
a= 2

4a + b = 5
4(2) + b = 5
8 + b = 5
b = 5 - 8 = -3

b) f(x) = 2x - 3

c) f(3) = 2(3) - 3 = 6-3=3