The graph below represents the amount of change Jaxon would receive, y, if he bought a item with a cost of x. Jaxon’s Change
A graph with cost of item on the x-axis and change on the y-axis. The line goes through points (1, 9), (2, 8), and (3, 7).

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