Diketahui fungsi f(x)=5x-4 Jika f(-2)=a dan f(b)=11 Hitunglah nilai a+b?

f(x)=5x-4
peny.
f(-2)=a
f(-2)=5(-2)-4
-2f =-10-4
-2f =-14
f =-14/-2
f =7

f(b)=11
f(x)=5x-4
f(11)=5(11)-4
11f =55-4
11f =51
f =51/11
f =4,63

a+b=x
7+4,63=
11,63