Notice that the position of our particle is marked at two times. At time = 1, t1 in this case, the position is at 3 meters from the origin . At time = 16 (t2) the position is at 13 meters from the origin. We label the initial point on the graph P1 and the final point P2. P1 has coordinates (t1,x1) and P2 has coordinates (t2,x2) in this plot. Click on the Action button for an example of one posible motion of the particle from P1 to P2.