and the blue line is the vector from the origin.
, A(0, 3, 1), B(2, 3, -1).
Draw 
and the equivalent
representation starting at the origin.
Solution:
a = < 2 - 0, 3 - 3, -1 - 1 > = < 2, 0, -2 >
The red line is the segment
and the blue line is the vector from the origin.
by: nl