Khan Academy: Algebra: Testing a Solution for a System of Equations

The brother-sister pair Carlos and Clarita need your class's help in developing their new pet sitting business. Through a variety of scenarios and concerns presented to the siblings, the learners thoroughly explore systems of equations...

Elimination is another method for solving systems of equations, in addition to graphing and substitution. Sal's lecture is straightforward to understand, even for students who struggle with learning. By having a variety of options when...

Sal begins this video by "massaging the equations slightly to prepare them for elimination." The equations won't be the only relaxed part of this lesson, which introduces the concept of multiplication to systems of equations. Viewers...

This video demonstrates how to test a solution for a system of equations by substituting the values back into each equations.

This video demonstrates how to take a given point and test if it is a solution for a system of inequalities by using substitution. [1:15]

Watch this video to learn how to find the solution to a system of equations with the substitution method! A teacher will lead you through each step necessary, explaining her steps and the reasoning behind her decisions. After watching...

This video demonstrates how to solve a systems of equations word problem related to the rates of passing trains. The problem involves finding a rate in meters/second and setting up and solving a system of equations. [9:07]

A video that demonstrates how to set up and solve systems of equations in order to answer word problems. [12:20]

This video demonstrates examples of special systems of equations that either have no solution or an infinite number of solution. These types of systems are called consistent or inconsistent systems. [15:18]

This video demonstrates how to solve several test questions related to systems of equations and systems of inequalities. [12:56]