The price of a book is $19.75. if a customer has a coupon that allows her to save $4.50 on the price of the book, how much will she pay for the book?

For this case we have that the original price of the book is given by:

$ 19.75

The customer has a coupon to save part of the price of the book.

Therefore, the customer will pay

Where,

x: value of the customer coupon.

We know that the customer has a coupon that has a value of $ 4.50.

Substituting values we have:

she will pay for the book 15.25 $

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