Which table shows a proportional relationship between x and y? Responses x 1 3 4 5 y 50 150 200 250 x 1 3 4 5 y 50 150 200 250 , x 2 4 5 6 y 6 12 18 21 x 2 4 5 6 y 6 12 18 21 , x 1 2 3 6 y 1.5 3 6 9 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 3 5 7 8 y 1.5 2.5 3 4.5 ,