simone has discovered a blow out sale at a shop in the mall. the cost of the 2 sweaters , 5 shirts and 3 pairs of pants is 172. the cost of the 5 sweaters and 8 pairs of pants is 269. the cost of 4 shirts and 1 pair of pants is 74 if x represents sweaters, y represents shirts and z represents pants which systems of equations can be used to determine the sale price of the sweaters the shirts and the pants