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f(5) = 3x + b = 13
f(5) = 3(5) + b = 13
15 + b = 13
b = 13 - 15
b = -2
f(9) = 3x + b
3(9) - 2
27 - 2 = 25
f(5)=13
13 =3 . 5 +b
-2 = b
f(9) = 3 . 9 + (-2)
= 27 -2
= 25