MIT has many lectures online as part of their Open Courseware. My favorite one is their Linear Algebra class taught by a great professor Gilbert Strang. His first lecture is a great introduction to matrices which we will be talking about in our next lecture.
Here is a link to the first lecture which is the one you guys should look at and if you are interested the rest of the course lectures are very good.
Pay attention to what he calls the “Column Picture.” This is the way we think of Matrices and Transforms in 3D graphics. I think he starts talking about this around 20 minutes into the lecture.
http://ocw.mit.edu/OcwWeb/Mathematics/18-06Spring-2005/VideoLectures/detail/lecture01.htm
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