Question

Diketahui fungsi f(x)=ax+b,jika f(3)=1 dan f(-1)=-7 nilai f(-5) adalah

Answer 1

F(x) = ax + b
1 = 3a + b
7 = -a + b
-------------- -
-6 = 4a
a = -3/2
1 = 3(-3/2) + b
1 = -9/2 + b
b = 1 + 9/2 = 11/2
f(-5) = -3/2 (-5) + 11/2
= 15/2 + 11/2 = 13