Which table shows a proportional relationship between x and y?


x 1 2 3 6
y 1.5 3 6 9

x 3 5 7 8
y 1.5 2.5 3 4.5

x 2 4 5 6
y 6 12 18 21

x 1 3 4 5
y 50 150 200 250