ketahui rumus fungsi f(x) = 3x + b. Jika f(5)=13, maka f(9) =

f(x) = 3x+b
f(5) = 3(5)+b
13 = 15 + b
13-15 = b
-2 = b

f(x) = 3x+b
f(9) =3(9)+(-2)
= 27-2
= 25

jadi, f(9) = 25

maaf ya kalo ada yg salah^^