The graph shows the relationship between the time in minutes, x, and the number of gallons of water, y, being pumped into a pool.

a. explain what each of the following coordinates means in terms of the time and the number of gallons of water: (0,0), (1,5), and (6,30). what is the unit rate? how do you know?

b. write an equation that can be used to find the number of gallons of water, y, in the pool at any time, x. identify the constant of proportionality in the equation.

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