fungsi f(x) = ax + b mempunyai f(2) = 5 dan f(5) = 14. nilai f(6) adalah? a. 15 b. 17 c. 18 d. 19

f(×) = ax + b
f(2) = 2a + b = 5 /5/ 10a + 5b = 25
f(5) =5a + b =14 /2/ 10a + 2b = 28
=> 3b = -3
=> b = -1

f(2) = 2a + b =5
=2a -1 = 5
= 2a =5+1
= 2a = 6
= a = 6/2
a =3

jadi
f(6) = 6a + b
=6(3) -1
=18 - 1
= 17