Wednesday, January 8, 2014

No.2

In today's lesson, we learned elimination. Their are several rules about elimination.
1. Obtain coefficients that differ only in sign
2. Add equations to eliminate a variable
3. Back substitute to solve for second equation
4. Check!

I also learned word problems dealing with speed and wind. If the plane goes with wind, the total rate is speed of plane plus the speed of wind. If the plane goes into the wind, the total rate is the speed of plane minus the speed of wind. Distance remains the same.

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2 comments:

  1. UnknownJanuary 12, 2014 at 8:58 PM

    fifi, you did so well at explaining! especially the word problem, it helped me understand the concept a lot better! thank you! :)

    ReplyDelete
  2. AnonymousJanuary 12, 2014 at 9:12 PM

    Great job in the explanation and I can see you make effort to do this! And it helps!

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