Diketahui funsi f(x) = 5x – 8. jika f(-2) = a dan f(b) = 22, nilai a+b adalah…

F(-2) = a
5.(-2)-8 = a
-10-8 = a
a = -18

f(b) = 22
5b-8 = 22
5b = 22+8
5b = 30
b = 30:5
b = 6

a+b = -18+6
a+b = -12