Solving Ax = b: Row Reduced Form R

Sick of ads?‚Äč Sign up for MathVids Premium
Taught by OCW
  • Currently 4.0/5 Stars.
6110 views | 3 ratings
Lesson Summary:

In this linear algebra lesson, you will learn how to solve linear equations of the form AX = B by using row reduced echelon form (rref). The first step is to identify whether or not the system has a solution by elimination, and if so, whether there is only one solution or a family of solutions. After finding one particular solution, you can add on any vector from the null space to get the complete solution. The null space is a subspace that consists of all combinations of special solutions that have a zero right-hand side.

Lesson Description:

Solving Ax = b: Row Reduced Form R -- Lecture 8. Learn how to solve equations that look like Ax = b using row reduced echelon form (rref).

Gilbert Strang, 18.06 Linear Algebra, Spring 2005. (Massachusetts Institute of Technology: MIT OpenCourseWare), (Accessed November 19, 2008). License: Creative Commons BY-NC-SA.
More info at:

Questions answered by this video:
  • How do you solve Ax = b?
  • What is row reduced echelon form?
  • What is rref?
  • When does Ax = b not have a solution?
  • Staff Review

    • Currently 4.0/5 Stars.
    This video explains how to find the solution to a matrix equation Ax = b, and to determine when there will not be a solution. The process used in this video is elimination to get to row reduced echelon form.
  • hammad

    • Currently 4.0/5 Stars.
    Very nice video sir. I am really impressed by your lecture. In fact, I didn't get a single word in my mind from the our class teacher. All my concepts are cleared here. Today, I am watching your video and tomorrow is my final exam. But I am 100% sure that I am going to get a good grade in linear algebra.