Question 684223
A pretty standard one would be time on the horizontal
axis and distance on the vertical axis. The slope of the line
would be velocity. The y-intercept would be the starting point
at time = 0. 
If you just consider the 2 given points, they are
( time[1], distance[1] ) and ( time[2], distance[2] )
You can pick whatever units you want, like
meters and seconds.
Hope this helps