Diketahui Fx=3x+5.jika nilai Fa=-13,maka nilai a adalah...

f(x) = 3x+5
f(a) = 3a+5
-13 = 3a+5
-13-5 = 3a
-18 = 3a
-18/3 = a
-6 = a

jadi nilai a = -6