Notice that neither of these equations are already solved for x or y . As a result, the first step is to solve for x or y first. Here's how it goes:

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.

Sal demonstrates how to solve a system of three linear equations in three variables using substitution.

Look at two ways to solve systems of linear equations algebraically: substitution and elimination. Look at systems of linear equations graphically to help us understand when systems of linear equations have …

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

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

The Algebra 1 course, often taught in the 9th grade, covers Linear equations, inequalities, functions, and graphs; Systems of equations and inequalities; Extension of the concept of a function; Exponential …

Notice that neither of these equations are already solved for x or y . As a result, the first step is to solve for x or y first. Here's how it goes:

Solve systems of equations where one of the equations is solved for one of the variables.

If one line is useful, let's see what we can do with two lines. 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.