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.

Solving a system of 3 equations and 4 variables using matrix row-echelon form

VIDEO 17:43 minutes
Sal solves a linear system with 3 equations and 4 variables by representing it with an augmented matrix and bringing the matrix to reduced row-echelon form.

Solving linear systems with matrices

VIDEO 7:37 minutes
Sal solves a linear system with 3 variables by representing it with an augmented matrix and bringing the matrix to 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