Which ordered pair is the solution to the system of equations? {x+3y=−12y=13x−6 (−5, −213) (−9, −9) (3, −5) (10, −223)

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$