Jillian is selling boxes of cookies to raise money for her basketball team. The 10 oz. Box costs $3. 50, while the 16 oz. Box costs $5. 0. At the end of one week, she collected $97. 50, selling a total of 24 boxes. The system of equations that models her sales is below. X+ y= 24 3. 50x + 5. 00y = 97. 50 solve the system of equations. How many 10 oz. Boxes were sold? 6 9 12 15.