Khan Academy on a Stick
Systems of equations
Solving a system of equations or inequalities in two variables by elimination, substitution, and graphing.
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Solving linear systems by graphing
Solving Linear Systems by Graphing
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Solving linear systems by substitution
Solving Linear Systems by Substitution
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Solving systems of equations by elimination
Solving Systems of Equations by Elimination
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Solving systems of equations by multiplication
Solving Systems of Equations by Multiplication
Solving systems of equations
Here we'll see that you may be able to actually solve for two unknowns if you have two different constraints or equations. You can view this solution as being represented by the intersection of the graphs of the two equations.
Using a system of equations to find the price of apples and oranges
Linear systems word problem with substitution