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? a.6 b.9 c.12 d.15