Tolong bantu jawab ya nnti dksih jawaban terbaikkk banget 1. Jika f (x) = ax+b, f (1) f (3) = 5 maka... A. F (x) = 3x - 4 B. F (x) = 3x + 4 C. F (x) = - 3x + 4

f(x) = ax + b

*f(1) = a + b
*f(3) = 3a + b

f(1) f(3) = 5
(a + b)(3a + b) = 5

◎ 5 = ( 1 ) ( 5 ) = ( 5 ) ( 1 )

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Misal :
a + b = 1
3a + b = 5
--------------- (-)
2a = 4
a = 2

a + b = 1
b = 1 - a
b = 1 - 2
b = -1

→ f(x) = ax + b = 2x - 1

●
Misal :
a + b = 5
3a + b = 1
--------------- (-)
2a = -4
a = -2

a + b = 5
b = 5 - a
b = 5 - (-2)
b = 5 + 2
b = 7

→ f(x) = ax + b = -2x + 7

Jadi, ada 2 jwaban yaitu :
→ f(x) = 2x - 1
→ f(x) = -2x + 7