Question

Diketahui fungsi f(x) = ax+b jika f(5) = 13 dan f(-2) = -8,maka tentukan nilai a dan b

Answer 1

F(5)=13
5a+b = 13
f(-2)=-8
-2a+b=-8
dieliminasi
5a+b=13
-2a+b=-8
________-
7a = 21
a=3

5(3)+b=13
b=-2

Answer 2

F(5) = 5a+b =13
f(-2) = -2a+b= -8
dieliminasi jadi(dikurang)
7a=21
a= 3
b= 5.3+b=13
b= 15+b =13
b= 13-15= -2