The city library is having a book sale to make room for the new books it purchased. The graph shows the cost, y, in dollars, to purchase x books at the sale.
Select the correct answer from each drop-down menu.

The (cost of the books)(number of books purchased) depends on the (cost of the books)(number of books purchased).
At the sale, each book costs $(0.25)(0.50)(0.75)(1.00).