Geometric Methods for Adding Vectors: Are You Doing It Right?

[Qube]

Represent the below vector relationship geometrically, illustrating two different ways of adding vectors.

Vector a - vector b = vector c.

I know the above relationship can also be expressed as:

Vector a + (-vector b) = vector c.

In other words, we flip the direction of vector b and add as usual.

Attached are two pictures of me adding two *arbitrary* vectors a and b (vectors a and b change in the two attached photos).

In the first picture, I use the parallelogram rule. In the second picture, I use another method to add the arbitrary vectors a and b.

Did I add the two vectors together correctly?

 

[Simon Bridge]

This is the sort of thing you can check for yourself.
http://www.wikihow.com/Add-or-Subtract-Vectors
Looks good to me but... how well you did will depend on the course and what they mean by "illustrating two different ways".

 

[Redbelly98]

Represent the below vector relationship geometrically, illustrating two different ways of adding vectors.

Vector a - vector b = vector c.

I know the above relationship can also be expressed as:

Vector a + (-vector b) = vector c.

In other words, we flip the direction of vector b and add as usual.

Attached are two pictures of me adding two *arbitrary* vectors a and b (vectors a and b change in the two attached photos).

In the first picture, I use the parallelogram rule. In the second picture, I use another method to add the arbitrary vectors a and b.

Did I add the two vectors together correctly?

Your problem statement has the "-" sign with vector b, but your drawing has the "-" sign on vector a instead. Other than that, you have the right idea.