Molly went shopping to buy jewelry. All of the pairs of earrings, e, cost $15.50 and the necklaces, n, cost $40.50. If she spends $158.50 and buys 7 items, how many necklaces and pairs of earrings did she buy? Enter a system of equations to represent the situation, then solve the system. Justify your answer.

The system of equations is blank and blank

Molly bought
blank pairs of earrings and
blank necklaces.