Anderson is a plumber and is paid a fixed amount just to make a house visit. The remainder of his fee, y, is determined by the number of hours that he works, x, as shown below.

Plumber Charges
A graph with hours worked on the x-axis and total paid on the y-axis. A line goes through points (0, 50), (10, 150), and (20, 250).

Which equation represents the graph?
y = 10x – 50
y = 10x + 50
y = 50x – 10
y = 50x + 10