Michael and Trevor are selling T shirts and sweatshirts with the school logo. Michael sells 10 Tshirts and 6 sweatshirts for $260. Trevor sells 5 Tshirts and 7 sweatshirts for $250. Write a system of equation to represent the situation. Using x for the price of tshirts and y for the price of sweatshirts. Solve the system of equations using elimination or substitution.