Adding vectors
To add two vectors together, start by drawing the first
one. Then, beginning at the arrowhead of the first vector, start drawing your
second vector. The answer is the vector from the start of your first
vector to the end of your second vector. So if I wanted to add 
and 
:
I’d need to start drawing at the arrowhead of :
The answer vector is vector 
, shown by the thick grey
line in the diagram.
Subtracting vectors
You never directly subtract vectors, instead you reverse the direction of them and add them. For instance, say I had to do this:
What I’d need to do is reverse the direction of vector and then just
add it:
