To Accumulate a Rate — Integrate!

Teaching High School Mathematics

6 Equations, 6 Unknowns, Guess and Check?

We did this problem in my Advanced Algebra class today. Yesterday we took the test on systems of equations including up to 3 equations with 3 unknowns. Today I put them in groups of four and didn’t give them any clue about how to solve this.

20121018-220314.jpg
I figured that it wasn’t fair to just do it on my calculator, so I started to work it out knowing full well that I was likely to mess something up along the way… A negative sign, a miss calculation, or a typo. Sure enough I did…

20121018-220520.jpg

20121018-220532.jpg
Then a kid came up and said he got it…. What???
Check it out…

20121018-220613.jpg
What are the chances? I didn’t give any clue about the answers.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Information

This entry was posted on October 19, 2012 by in Uncategorized.
%d bloggers like this: