Any points that fall on the graph is an ordered pairs.
Here are a few ordered pairs:
When x = 0, y = (0) - 3 = -3
(0, -3) is an ordered pair.
when x = 1, y = (1) - 3 = -2
(1, -2) is an ordered pair.
when x = 2, y = (2) - 3 = -1
(2, -1) is an ordered pair.