The displacement from point B to point A is:

- The x displacement: 2-7 = -5
- The y displacement: 1-3 = -2

So the column matrix representing the displacement is:

e = (-5, -2)^{T}

When the points are visited in the opposite order, the displacement vector points in the opposite direction. In the column matrix each element is -1 times the old value.

The displacement from A to B is different from the displacement from B to A.
Think of displacement as "directions on how to walk from one point
to another."
So, if you are standing on point A and wish to get to point B,
the displacement (5, 2)^{T} says "walk 5 units in the positive X direction,
then walk 2 unit in the positive Y direction."

Of course, to get from point B to point A you need different directions:
the displacement (-5, -2)^{T} says "walk 5 units in the
*negative* X direction,
then walk 2 unit in the *negative* Y direction,"
which puts you back on point A.

The displacement from point **Start** to point **Finish** :

displacement = (Finish x - Start x , Finish y - Start y)^{T}

Say that point C is x=4, y=2 and that point D is x=3, y= 5 . What column matrix represents the displacement from C to D?

( )^{T}