Algebra-1

To determine the number of fiction books, we can set up a system of equations based on the given information.

Let x be the number of fiction books and y be the number of non-fiction books.

We know that the library sold a total of 40 books. This information can be translated into the equation: x + y = 40

We also know that each fiction book costs $10 and each non-fiction book costs $15. Thus, the equation representing the total costs can be...