Aziz has a job mowing lawns in the summer. The graph below shows the amount of earnings, in dollars, based on the number of lawns Aziz mows.
The graph has number of lawns on x-axis and earnings on y-axis. A straight line connects the points (0, 0), (1, 18), (2, 30), (3, 50), (4, 65) and (5, 80).
Enter an equation to represent the amount of earnings, e, in dollars, that Aziz makes in terms of the number of lawns, n, that he mows.