During a snowstorm, Sarah tracked the amount of snow on the ground. When the storm began, there were 4 inches of snow on the ground. For the first 3 hours of the storm, snow fell at a constant rate of 1 inch per hour. The storm then stopped for 4 hours and then started again at a constant rate of 3 inches per hour for the next 5 hours. Make a graph showing the inches of snow on the ground over time using the data that Sarah collected.