Souvenir hats T-shirts and jackets are sold at a rock concert Three hats, two T-shirts, and one jacket cost $140. Two hats, two T-shirts, and two Jackets cost $170. One hat three T-shirts, and two jackets cost $180. Let x represent the number of souvenir hats sold, y represent the number of T-
shirts sold, and z represent the number of jackets sold.