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September 21, 2012 at 7:41 am
#496

Anonymous

Inactive

From *CPM *Mathematics:

Assuming the students have just completed the lesson on the Substitution Method, I’ll begin the Elimination Lesson by having the students work out the following system:

2x+3y=-2

5x-3y=16

A minute in, they will likely become annoyed due to the fractions created by getting a variable alone. Stop them midway through the problem and ask “What’s annoying about this problem?” to which they’ll say the fractions. I’ll then ask them if anyone sees a different, “better” way to do this problem. Begin Elimination method.