Diketahui suatu fungsi f dengan domain A = {6, 8, 10, 12} dan kodomian himpunan bilangan asli persamaan fungsinya adalah f(×) = 3× - 4

f (x) = 3x -4
f (6) = 3 (6) -4 = 18 -4 = 14
f (8 ( = 3 (8) - 4 = 24 -4 = 20
f (10) = 3 (10) -4 = 30 -4 = 26
f (12) = 3 (12) - 4 = 36 -4 = 32
kodomain = { (6, 14), ( 8, 20), (18, 26), (12, 32)}