the local bookstore is having a sole on used books . nate bought 3 hardcover books and 7 paperback books and spent 29.50. tia bought 2 hardcover books and 5 paperback books and spent 20.50. what is the cost of a hardcover book
The first thing we must do for this case is to define variables.  We have then:  x = cost of a hardcover book  y = cost of a paperback book  We write the system of equations:  3x + 7y = 29.50  2x + 5y = 20.50  The solution to the system is:  x = 4 $  y = 2.5 $  Answer:  the cost of a hardcover book is $ 4
