Khan Academy: Solving Systems: Testing a Solution for a System of Equations

When guess and check gets old, it's time to start graphing! An instructive lesson explains how to solve a system of linear equations using graphing. Equations are in both slope-intercepts and standard form. 

Solving systems of equations underpins much of advanced algebra, especially linear algebra. Developing an intuition for the kinds and descriptions of solutions is key for success in those later courses. This intuition is exactly what...

Which method of solving systems is the best? Individuals watch the same system solved using elimination, then substitution, and finally graphing. They can compare the different methods and see how each method results in the same solution.

Video gives example of hypothesis testing with an example related to medical testing. Includes setting up a null hypothesis and an alternative hypothesis. [11:26]

Watch [1:56] Sal work through a basic Solving systems of linear equations problem.

Watch [4:29] Sal work through a harder Solving systems of linear equations problem.

This video gives two examples of how to solve systems of equations by elimination.

Show that you have mastery over the idea behind hypothesis testing by calculating some probabilities and drawing conclusions. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...

Explore the concept of systems of equations in two variables and use matrices to solve them. Young mathematicians enter coefficients and constants into a matrix and then solve using row reduction. Instructions on how to use the shortcut...

This video demonstrates how to solve systems of equations by elimination.