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.

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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 …

A troll forces us to use algebra to figure out the make-up of his currency. We end up setting up a system of equations. Created by Sal Khan.

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

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 …

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!

Solve word problems that involve systems of equations, where there can either be a single solution, no solution, or infinite solutions.

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

Sal solves a system of two linear equations in standard form, and then approximates the solution of a system whose solution isn't clearly visible.