Jillian is selling boxes of cookies to raise money for her basketball team. The 10 oz. box costs 3 point 5 0 dollars , while the 16 oz. box costs 5 point 0 0 dollars At the end of one week, she collected 97 point 5 0 dollars , selling a total of 24 boxes. The system of equations that models her sales is shown. x plus y is equal to 24; 3 point 5 0 x plus 5 point 0 0 y is equal to 97 point 5 0 Solve the system of equations. How many 10 oz. boxes were sold?