For the problem below, go through the same type of steps that you did for the problem above. This problem has two variables, rather than three, but the steps in the process are still similar. 14. At a sporting event (prices were high) a vendor sold 130 ounces of soda in the first ten minutes. Available sizes were 10 and 30 ounce cups (small, large). The prices were $3 for a small, and $9 for a large. How many of each size did the vendor sell, if total revenue was $39? Write your equations. Use rref to solve. Write the general solution, or pattern. Set each part of the solution, or pattern greater than or equal to zero; then solve to find your restrictions. List all possible values for your restricted variable. Plug all possible values for the variable through your pattern, to find all solutions.

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