The Unruly Queens chess club is hosting a tournament, and each club member is bringing something to eat or drink. Patty decides to bring oatmeal raisin cookies from her favorite bakery. This table shows the relationship between the number of oatmeal raisin cookies Patty buys, x, and their total cost (in dollars), y. x (cookies)y (dollars) 15$39.60 20$52.80 30$79.20 45$118.80 According to the values in the table, do x and y have a proportional relationship?