Let P1 = P1(2, 1, -2) and P2 = P2(1, -2, 0). Find the coordinates of P, which is 1/4 the way from P2 to P1. The answer is P = P(5/4, -5/4, -1/2) Can someone explain to me the concept of this? I don't quite understand it. So basically we are suppose to find a vector P that is 1/4 away from (P1 - P2)? The solution manual does (1/4)P1 + (3/4)P2 = P. Why? Thanks in advance.