An observation point was originally in line with the top of a waterfall, but the waterfall moves a constant
distance each year from erosion. The following graph shows the relationship between the time since 1998 and
the distance the top of the waterfall is from the observation point. Negative years represent time before 1998.
Distance from
observation point (m)
-10
15
-5 5 10
Years since 1998
What feature of the graph represents the distance from the observation point in 2003?