Question

Fungsi f dirumuskan f(x) =ax+b dengan a dan b bilangan bulat. Jika f(5)=-7 dan f(-3) =9, berapa nilai f(1)?

Answer 1

5a+b = -7
-3a+b = 9
_______-
8a = -16
a = -2

5*-2+b = -7
-10+b = -7
b = 3

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

Answer 2

F (x) = ax + b
f (5) = -7
f (-3) = 9
5a + b = -7
-3a + b = 9
________ _
8a = -16
a = -16/8
a = -2

5a + b = -7
5.(-2) + b = -7
-10 + b = -7
b = -7 + 10
b = 3

f (x) = -2x + 3
f (1) = -2.1 + 3 = 1
semoga membantu -,-