GeoGebra CAS (Symbolic Calculation)

1 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