The vector between two points can easily be expressed using the position vectors of each point. The point can be rewritten as a position vector: .
You do the same with the other point , and get . You can now create the vector between the two points by subtracting the end point from the starting point, which is the difference . This is how you find the vector between two points:
Rule
Example 1
You have the points and . Find .
Rewrite the points as position vectors:
Next, find :