Solving Systems of Linear Equations
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Introduction to Solving Systems of Linear Equations
http://www.youtube.com/watch?v=shYwbjyoMhU
Solving a Linear System by Graphing
http://www.youtube.com/watch?v=jR6ELpJe5uM
Solving A linear System Algebraically by Elimination
http://www.youtube.com/watch?v=6c7OPYQLVG0
Solving a Linear System Algebraically by Substitution
http://www.youtube.com/watch?v=PIzV_NYkhUM
http://www.youtube.com/watch?v=5FGLWUUuhyU
(this one above includes "no solution", and "infinite solutions"