At a fast-food joint, 11 cheeseburgers and 3 shakes cost $20.50. At the same fast-food joint, 7 cheeseburgers and 2 shakes cost $13.25. The price of a cheeseburger and the price of a shake can be determined by a solving system of equations, 11x + 3y = 20.50 7x + 2y = 13.25 where x represents the price of a cheeseburger and y represents the price of a shake. How much does a cheeseburger cost at the fast-food joint? How much does a shake cost? At the fast-food joint, a cheeseburger costs $ and a shake costs

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