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Mapel : Matematika
Materi : Relasi dan Fungsi

f(x) = ax + b

f(-1) => -a + b = -8
f(2) => 2a + b = 13
--------------------------- –

-3a = -21
a = 21/3
a = 7

-a + b = -8
-7 + b = -8
b = -8 + 7
b= -1

Maka,
f(5) = 7x - 1
f(5) = 7(5) - 1
f(5) = 35 - 1
f(5) = 34

≡ diketahui :

f(x) = ax + b
f(-1) = - 1a + b = - 8
f(2) = 2a + b = 13

≡ penyelesaian :

⇒Tentukan nilai a :

- 1a + b = - 8
2a + b = 13
––––––––– -
- 3a = - 21
a = - 21 / - 3
a = 7

⇒Tentukan nilai b :

2a + b = 13
2(7) + b = 13
14 + b = 13
b = 13 - 14
b = - 1

⇒Jika f(x) = ax + b , maka f(5) :

masukkan nilai a dan b

f(5) = (7)x + (-1)
f(5) = 7x - 1
f(5) = 7(5) - 1
f(5) = 35 - 1
f(5) = 34 [ opsi. C ] [tex]~[/tex]