How Do You Solve a System of Equations Using the Substitution Method?

Note:

There are many different ways to solve a system of linear equations. In this tutorial, you'll see how to solve a system of linear equations by substituting one equation into the other and solving for the variable. Then, see how to use that variable value to find the value of the other variable. Check it out!

Keywords:

problem
line
linear equations
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2 equations
find intersection
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solve by substitution
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consistent
1 solution
independent
2 equations
2 unknowns
2 variables

Background Tutorials

Writing and Solving Equations with Variables on Both Sides
- How Do You Solve an Equation with Variables on Both Sides?
  
  Trying to solve an equation with variables on both sides of the equal sign? Figure out how to get those variables together and find the answer with this tutorial!
What are Simultaneous Linear Equations in Two Variables?
- What's a System of Linear Equations?
  
  A system of equations is a set of equations with the same variables. If the equations are all linear, then you have a system of linear equations! To solve a system of equations, you need to figure out the variable values that solve all the equations involved. This tutorial will introduce you to these systems.
- What's a Solution to a System of Linear Equations?
  
  If you have a system of equations that contains two equations with the same two unknown variables, then the solution to that system is the ordered pair that makes both equations true at the same time. Follow along as this tutorial uses an example to explain the solution to a system of equations!
Reasoning in Algebra and Geometry
- What is the Substitution Property of Equality?
  
  If you ever plug a value in for a variable into an expression or equation, you're using the Substitution Property of Equality. This property allows you to substitute quantities for each other into an expression as long as those quantities are equal. Watch this tutorial to learn about this useful property!