Question

Diketahui rumus fungsi f(x) = ax + b. jika f(3) = 15 dan f(-2) = 10, tentukanlah.
a. nilai a dan b
b. rumus fungsi f(x)
c. nilai f(7)

Answer 1

A.) f(x) = ax + b
f(3) = 3a + b =15
f(-2) = -2a + b = 10
____________________ -
= 5a = 5
= a = 1

maka b , 3a + b =13
3 + b = 13
b = 13-3
b = 10
b.) a = 1 ,b =10
f(x) = ax + b
f(x) = x + 10
c.) f(7) = 1×7 + 10
f(7) = 17