Khan Academy on a Stick
Matrices: Reduced Row Echelon Form 3
And another example of solving a system of linear equations by putting an augmented matrix into reduced row echelon form
If the above player doesn't work, you can try this direct link.
And another example of solving a system of linear equations by putting an augmented matrix into reduced row echelon form
If the above player doesn't work, you can try this direct link.