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 $5.00. 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?

9514 1404 393Answer:   15Step-by-step explanation:We see that x represents the number of 10-oz boxes sold. Then y=24-x is the number of 16-oz boxes sold. Substituting for y in the second equation gives ...   3.50x +5.00(24 -x) = 97.50   -1.50x +120 = 97.50   22.50 = 1.50x . . . . . . . add 1.50x -97.50   15 = x . . . . . . . . . . . . . . divide by 1.5015 10-oz boxes were sold.