This unit discusses systems of linear equations and their solutions.

This video shows how one can solve a system of linear equations by carefully graphing them and seeing where the lines intersect.
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This video shows an algebraic technique for solving systems of equations. One solves for one variable and substitutes it into the second equation.
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This video shows a second algebraic technique for solving systems of equations: elimination. One works to eliminate one variable by combining two equations. In all these examples, the elimination requires but a single step.
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This video extends the technique of elimination to include more complicated problems requiring multiplication.
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This video classifies systems of linear equations by whether they are consistent (unique solution), dependent (multiple solutions), or inconsistent (no solutions).
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This video tackles the problem of systems of simultaneous inequalities. Their solution can be shown graphically or algebraically.
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