The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled.
Graph shows a ray plotted in the first quadrant of a coordinate plane with time in hours on X-axis and water in gallons on Y-axis. The ray begins at (0, 400) on Y-axis and extends through (5, 300).
The total capacity of the water tank is
gallons, and the rate of change is
gallons per hour.
