4) a sales associate in a department store earns a commission on each suit and each pair of shoes sold. one week, she earned $47 in commission for selling 3 suits and a pair of shoes. the next week, she earned $107 in commission for selling 7 suits and 2 pairs of shoes. a) write a system of equations to represent the situation. explain what your x and y will represent. b) solve the system of equations. c) how much commission does she earn for selling each suit and each pair of shoes?