Solving a System Using the Same Variable
Practice solving a system of equations with the same variable.
System of Two Equations Defined
Definition of a system of equations.
Solving Systems with Substitution Example
The substitution method can be used when one of the equations in a system has been solved for one of its variables. An example demonstrates.
Both Equations in a System Contain the Same Variable
Solving a system of equations using the substitution method when both equations contain the same variable.
Solving Systems with Substitution
An introduction to using the algebraic method of substitution to solve a system of equations in which one of the equations is not in slope-intercept form.
When the Elimination Method is Easiest
How to decide whether substitution or elimination is the better method for solving a system of equations when both equations are in the same form and neither has been solved for a variable.
Addition Property of Equality, The
The addition property of equality is explained and demonstrated.
System of Two Equations: A Revenue Graph and a Cost Graph
Using a system of equations to plot a business's break-even point.
Deciding Between Substitution and Elimination
How to decide whether substitution or elimination is the better method for solving a system of equations in which one equation has been solved for a variable.
Check Answers to Both Equations in a System
It's important to check the solution against both equations in a system.