SOLUTION: Uhm. How does substitution and elimination work?

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Question 694159: Uhm. How does substitution and elimination work?
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
Watch these videos for substitution:
http://www.youtube.com/watch?v=S5ThT_qvL98
http://www.youtube.com/watch?v=oDSQVI7aZGM
http://www.youtube.com/watch?v=V7H1oUHXPkg
http://www.youtube.com/watch?v=-uX1R9Pd-WU
Watch these videos for elimination:
http://www.youtube.com/watch?v=awIMaSkY_g4
http://www.youtube.com/watch?v=nok99JOhcjo
http://www.youtube.com/watch?v=K9IG-aCHCSE