At a library book sale, there is one price for hardback books and one price for paperback books. . Last week, 70 hardbacks and 120 paperbacks were sold, for a total of $165.
• This week, 80 hardbacks and 180 paperbacks were sold, for a total of $210.
A. Write a system of equations that can be solved to find h, the price in dollars of each hardback book, and p, the price in dollars of each paperback book.