K. 1 Find the constant of proportionality from a table

ZCK

The Crafty Clay Art Show has invited Roger to make and sell his famous decorative plates. He molds the plates out of clay and then paints them.

This table shows the relationship between the number of plates Roger makes, x, and the amount of clay he uses (in pounds), y.

x (plates) y (pounds)

5 12. 3

10 24. 6

15 36. 9

20 49. 2

According to the values in the table, do x and y have a proportional relationship?

yes or no