A discount book store sells hardcover books for $8 each and paperbacks for $4 each. The number of hardcover books, h, sold one day was 2 more than four times the number of paperback books, p, sold that same day. The total amount of sales for that day was $160. Jean-Paul wrote the following system of linear equations to find the number of each type of book sold.
8 h + 4 p = 160. p = 4 h + 2.
What is Jean-Paul's error?
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