Khan Academy on a Stick
Systems of equations and inequalities
What happens when we have many variables but also many constraints.

Trolls, Tolls, and Systems of Equations
A troll forces us to use algebra to figure out the makeup of his currency. We end up setting up a system of equations

Solving the Troll Riddle Visually
Solving the system of equations visually. Now we can save the prince/princess

King's Cupcakes: Solving Systems by Elimination
Using simple elimination to figure out how many cupcakes are eaten by children and adults

How many bags of potato chips do people eat?
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Using elimination to solve a system of equations

Systems with Elimination Practice
Example of solving systems of equations with elimination

Talking bird solves systems with substitution
Solving systems of equations with substitution.

Inconsistent systems of equations
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Systems of equations without a solution

Infinite solutions to systems
Consistent, but dependent systems of equations

Consistent and Inconsistent Systems
Consistent and Inconsistent Systems

Independent and Dependent Systems
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Independent and Dependent Systems
Solving systems of equations for the king
Whether in the real world or a cliche fantasy one, systems of equations are key to solving superimportant issues like "the makeup of change in a troll's pocket" or "how can order the right amount of potato chips for a King's party." Join us as we cover (and practice with examples and exercises) all of the major ways of solving a system: graphically, elimination, and substitution. This tutorial will also help you think about when system might have no solution or an infinite number of solutions. Very, very exciting stuff!

Visualizing the solution set for a system of inequalities
Visualizing the solution set for a system of inequalities

Graphing systems of inequalities
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Graphing systems of inequalities

Graphing systems of inequalities 2
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Graphing systems of inequalities 2
Systems of inequalities
You feel comfortable with systems of equations, but you begin to realize that the world is not always fair. Not everything is equal! In this short tutorial, we will explore systems of inequalities. We'll graph them. We'll think about whether a point satisfies them. We'll even give you as much practice as you need. All for 3 easy installments of... just kidding, it's free (although the knowledge obtained in priceless). A good deal if we say so ourselves!

Systems of Three Variables
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Systems of Three Variables

Systems of Three Variables 2
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Systems of Three Variables 2

Solutions to Three Variable System
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Solutions to Three Variable System

Solutions to Three Variable System 2
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u14 l3 t1 we4 Solutions to Three Variable System

Three Equation Application Problem
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Three Equation Application Problem
Systems with three variables
Two equations with two unknowns not challenging enough for you? How about three equations with three unknowns? Visualizing lines in 2D too easy? Well, now you're going to visualize intersecting planes in 3D, baby. (Okay, we admit that it is weird for a website to call you "baby.")

NonLinear Systems of Equations 1
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NonLinear Systems of Equations 1

NonLinear Systems of Equations 2
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NonLinear Systems of Equations 2

NonLinear Systems of Equations 3
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NonLinear Systems of Equations 3
 Systems of nonlinear equations 2
 Systems of nonlinear equations 3
Nonlinear systems of equations
Tired of linear systems? Well, we might just bring a little nonlinearity into your life, honey. (You might want to brush up on your solving quadratics before tackling the nonlinear systems.) As always, try to pause the videos and do them before Sal does!