diketahui f(x) =Ax+B jika f(-1)=1 dan f(1)=7 tentukan nilai A dan B

Diketahui :
- f(x) = ax + b
- f(- 1) = 1
- f(1) = 7

Ditanya :
A. Nilai a = ....?
B. Nilai b = ....?

Penyelesaian :
A. Nilai a :
f(- 1) = - a + b = 1
f(1) = a + b = 7

- a + b = 1
a + b = 7
_______ _
- 2a = - 6
a = - 6/- 2
a = 3

B. Nilai b :
a + b = 7
3 + b = 7
b = 7 - 3
b = 4

Maaf Kalau Salah

a.-1+b = 1
= -a+b=1

a.1+b = 7
= a+b=7

-a+b = 1 - a+b = 7
= -2a = -6
a= -6:-2
a=3


a+b = 7
3+b = 7
b = 7-3
b = 4


jadi A = 3
B = 4



semoga membantu!!!