If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Solving systems by elimination

3 videos
This tutorial is a bit of an excursion back to you Algebra II days when you first solved systems of equations (and possibly used matrices to do so). In this tutorial, we did a bit deeper than you may have then, with emphasis on valid row operations and getting a matrix into reduced row echelon form.

Matrices: Reduced row echelon form 1

VIDEO 17:43 minutes
Solving a system of linear equations by putting an augmented matrix into reduced row echelon form

Matrices: Reduced row echelon form 2

VIDEO 7:37 minutes
Another example of solving a system of linear equations by putting an augmented matrix into reduced row echelon form

Matrices: Reduced row echelon form 3

VIDEO 12:08 minutes
And another example of solving a system of linear equations by putting an augmented matrix into reduced row echelon form