Which situation represents a non-proportional relationship between x and y? The total number of books a store sells, y, in x hours if it can sell 6 books per hour in the store and 2 books per hour online.

The number of marbles Ben has, y, is 5 more than twice the number of marbles Amy has, x.

The perimeter of a square tile in inches, y, with a side length of x inches.

The amount of soda, y, a machine produces in x minutes if it makes 4/5 gallons of soda every minute.