Charlene owns a bookstore. She purchases used books from customers. She pays $3.50 for each hardback book. • She pays $0.75 for each paperback book. Charlene pays a customer a total of $199.75 for 149 used books. ● Which system of equations could be used to determine the number of hardback books (x) and the number of paperback books (v) Charlene purchases from the customer?
A x+y=149 3.50x + 0.75y = 199.75
Bx + y = 149 0.75x + 3.50y = 199.75
C x + y = 199.75 0.75x + 3.50y = 149
D×+y=199.75 3.50+0.75y=149​