If I buy 1 shirt and 2 pairs of pants for $31. My friend buys 3 shirts and 1 pair of pants. how much did each item cost?

Answer 1

S + 2P = 31

3S + P = 31

P = 31-3S

S +2(31-3S) = 31

31 = 5S

S= 31/5 = $6.20 for a shirt

P =31- 3(6.2) = 31-18.6 = $12.40 for a pair of pants.