Vector  a=(2,1)  and  b=(1,3)
Make their sum c=a+b
Make a drawing with vector b
starting in the point  (2,1)

Make the point A = (2,2) and the vector b = (1,3).
Make the line starting in A, direction b.

In beta-version 5:
Make the vectors a=(2,1,1) and b=(1,3,1)
Make their sum c=a+b
Make a drawing of vector b starting in 
the point (2,1,1)

In beta-version 5:
Make the point A = (2,2,0) and vector b = (1,3,1)
Make the line starting in point A, direction b.

b = (1, 3)
A = (2, 2)
a = Line(A, b)