x = 1/2; y = 12 + 4 = 16

x = 1; y = 6 + 4 = 10

x = 2; y = 3 + 4 = 7

x = 3; y = 2 + 4 = 6

x = 6; y = 1 + 4 = 5

x = 12; y = 1/2 + 4 = 4,5