Duane, Scott, and Brent started their own lawn mowing service. Because of school, they only mow on Saturdays. They tracked the number of lawns they mow each month and determined that on average they work 16 hours and mowed 80 lawns. Brent decided to make a graph to show the number of hours worked and the corresponding number of lawns mowed. The graph he created is a straight line. Select all points with integer only coordinates that the line passes through on the graph.