Amelia competed in a race in which she ran at a constant speed. a graph that represents the relationship between the number of seconds amelia ran, x, and the total distance she ran in meters, y, shows that in 15 seconds she ran 67.5 meters. what point could be on amelia's graph?

Right now you already have 2 points on that graph.  They are (0,0) and (15,67.5).  

It sounds like you were given a couple of points to choose from; if so, could you please share them?

From the given info you could quickly find the slope, m, of this linear graph.  Then check out each of the given points by substituting the x- and y-coordinates into the equation y = mx of this graph.  If the equation proves to be true for a certain point, then you've found your answer.

Xis equal to three