f(x)=a×+b f(3)=15 f(5)=20 pertanyaan:A.nilai a dan b B.bentuk fungsinya C.nilai f(4n)

a) F(x)=ax+b

F(3) = a×3+b
15 = 3a+b
F(5) = a×5+b
20 = 5a+b

15 = 3a+b
20 = 5a+b
--------------- --
-5 = -2a
5 = 2a
2,5 = a

15 = 3a+b
15 = 3×2,5+b
15 = 7,5+b
b = 15/7,5
= 2

C) F(4n) = 2,5×4n+2
= 10n+2

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