Question

Pada fungsi f(x) = ax + b dengan f(1) = 3 dan f(2) = 5
Tentukan :
A. Nilai a dan b
B. Bentuk fungsinya
C. F(-2)

tolong dijawab beserta caranya :D
makasih :)

Answer 1

Verified answer

F(1) = a+b=3
f(2)=2a+b=5
lakukan eliminasi
2a + b = 5
a + b = 3
________-
a = 2

maka
a + b = 3
2 + b = 3
b = 1

bentuk fungsi :
f(x) = 2x + 1

f(-2) = -2a + b
= -2(2) + 1
= -4 + 1
= -3

Answer 2

F(x) = ax + b
f(1) = a + b
3 = a + b
f(2) = 2a + b
5 = 2a + b

dieliminasikan
2a + b = 5
a + b = 3
---------------- --
a = 2

a + b = 3
2 + b = 3
b = 3 - 2
= 1

A. a = 2
b = 1

B. f(x) = ax + b
f(x) = 2x + 1

C. f(x) = 2x + 1
f(-2) = 2 × (-2) + 1
= -4 + 1
= -3

Semoga membantu ^^