Monday, September 24, 2012

Why does the Elimination Method Work?

When solving Linear System such as:

Why does the elimination method work?  Three students posed this today in our Video Summarizer Google Spreadsheet, and I believe this is a wonderful example of technology allowing for all voices in class to be heard.

I'll post a follow up after tomorrow's class with the answer.  Great questions everyone.  Keep them coming!

Mr. Morrissey

p.s. I assume everyone can solve this and graph it.  Also, tell your parents about the invisible 1.

p.p.s.  This works since 2x+y actually equals 8.  So adding 2x+y to the LHS (left hand side) is the same as adding 8 to the RHS.  The equality still holds.  3x=18.  x=6.  -PMM 9/25/2012

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