GeoGebra CAS (Symbolic Calculation)

http://youtu.be/SqcmGZai6Zk

2: Solving System of Equations
http://youtu.be/wIUezT7gC90

3: Solving Simultaneous Equations by Elimination
http://youtu.be/mUBns5z8yMw

4: Solving Simultaneous Equations by Substitution
http://youtu.be/20XqJoJ5sxI

5: Solving Simultaneous Equations Algebraically and Graphically
http://youtu.be/FaptneTlmgM

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