A scatterplot displays the relationship between the volume of water, in liters, in a swimming pool and the time, in hours, since a pump began draining the pool. A line of best fit is drawn. The line passes through the points and . What does the slope of this line represent in the context of the problem?
The initial volume of water in the pool.
The rate at which water is being drained from the pool, in liters per hour.
The total time it takes to drain the pool.
The maximum volume of water the pool can hold.
