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Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 30 liters per minute. There are 600 liters in the pond to start. Let W represent the amount of water in the pond (in liters), and let T represent the number of minutes that water has been added. Write an equation relating W to T, and then graph your equation using the axes below.

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The total amount of water in the pond is the sum of the amount of water originally in it and the water that they are just about to pour in. The equation that best represent the situation would be,
                                    W = 600 + 30T
The graph of the equation is a line with slope of 30 and y-intercept of 600. 

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