The data in the following table show the amount of water in milliliters a professional tennis player loses for various times, in minutes, of play during a tennis match. Time of Workout (in minutes), x 10 20 30 40 50 60 Water Lost (in milliliters), y 500 900 1,200 1,500 2,000 2,200 (a) Use the points (10, 500) and (60, 2,200) to find a linear model that will predict the water lost y (in mL) by a player who has been playing for x minutes. y =     (b) Use your linear model to estimate the amount of water lost (in mL) by a player who has been playing for 15 minutes. mL

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