Khan Academy: Algebra: Systems of Three Variables 2

Put all that algebra learning to use! Using algebraic strategies, learners solve three-variable systems. They then use the three-variable systems to write a quadratic equation given three points on the parabola.

Sal uses the elimination method to simplify a system of three variables. Next, he employs the substitution method to check his solution. This resource would nicely complement any lesson on this topic.

This video demonstrates how to solve a system comprised of three equations in three variables. [8:23]

How many different ways can three planes intersect? The interactive provides three movable planes. Pupils manipulate the planes to determine the number of solutions possible based upon their intersections.

This video demonstrates how to solve systems of linear equations in two variables using the elimination method. There are three sample problems shown. [9:57]

Given a system of three linear equations, the student will solve the system with a unique solution.

This video demonstrates how to solve a word problem by setting and solving a system of linear inequalities. [8:09]

A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...

This lesson video shows how to solve a system of three equations with three unknown.

This video demonstrates how to find the solution set for a system of three linear inequalities. [3:24]