Which table shows a proportional relationship?

Question

1# x 4 8 12 16 20
y 2 4 8 14 20

2# x 5 10 15 20 25
y 1 2 3 4 5

3# x 12 14 16 18 20
y 6 12 18 24 30

4# x 3 6 9 12 15
y 4 10 16 22 28

Answer 1

The second table shows a proportional relationship.