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The substitution method is a technique for solving a system of equations. This article reviews the technique with multiple examples and some practice problems for you to try on your own.

The tricky thing is that there are two variables, x and y . If only we could get rid of one of the variables... Here's an idea! Equation 1 tells us that 2 x and y are equal. So let's plug in 2 x for y …

How can you use clues from two algebraic expressions to figure out the value of a variable? In this unit, you'll learn how to solve a system of equations or inequalities in two variables by …

Learn to solve the system of equations y = -5x + 8 and 10x + 2y = -2 using substitution.

This topic covers: - Solutions of linear systems - Graphing linear systems - Solving linear systems algebraically - Analyzing the number of solutions to systems - Linear systems word problems

In this unit, we learn how to write systems of equations, solve those systems, and interpret what those solutions mean in a real-world context. Unit guides are here!

A "system of equations" is when we're dealing with more than one equation at the same time. These tutorials show you how to set up and solve systems of equations.

And in this video, I'm going to show you one algebraic technique for solving systems of equations, where you don't have to graph the two lines and try to figure out exactly where they intersect.

Learn to solve the system of equations -3x - 4y = -2 and y = 2x - 5 using substitution. Created by Sal Khan.