If a bookshelf is 28 1/8 inches long, how many 1 7/8 inch thick books will it hold?

Bookshelf can hold 15 books.

Step-by-step explanation:

Given : The length of the book shelf = inches

In improper fraction ,  

i.e. Length of the book shelf = inches

Similarly, Thickness of a book = inches

Now, the number of books the shelf can hold =  Length of the bookshelf ÷Thickness of a book

Hence, the bookshelf can hold 15 books.

4th option is correct xy=-10

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-6 is the correct option from the above given options