Diketahui fungsi f(x)=ax+b. Jika f(-2)= -11 dan f(4)=7,nilai a+b adalah?
Jawaban
f(x) = ax + b
f(-2) = -11
f(4) = 7
a + b = . . .?
f(-2) = -2a + b = -11
f(4) = 4a +b = 7
-2a + b = -11
4a + b = 7 _
-6a = -18
a = -18/-6
a = 3
4a + b = 7
4 . 3 + b = 7
12 + b = 7
b = 7 – 12
b = -5
a + b = 3 + (-5) = -2
Cmiiw dan semoga membantu.