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"Archimedes will be remembered when Aeschylus is forgotten, because languages die and mathematical ideas do not. 'Immortality' may be a silly word, but probably a mathematician has the best chance of whatever it may mean." (Godfrey Hardy)
Algebra 1 (substitution method)
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kloliver
Posted 11/13/2008 12:12 PM (#2248)
Subject: Algebra 1 (substitution method)
Math

Posts: 37
25
Location: Lafayette
When you teach the substitution method, do you only give the students examples where x and y are already solved for? I don't see the purpose of using the substitution methond unless they are solved for. I guess what I'm trying to say, is why make it harder than it needs to be?
mdmdavis
Posted 11/24/2008 3:36 PM (#2272 - in reply to #2248)
Subject: RE: Algebra 1 (substitution method)
Math

Posts: 108
100
Location: Henry Clay
I agree, that is why there are methods other than substituion. We talk alot abut which method to use and why substitution is good for this problem and why elimination is good for this one and graphing good for that one. If I give them some not solved for , on rare occasion, it's just x+..... so that's really easy to solve.
ccprek
Posted 11/25/2008 9:41 AM (#2291 - in reply to #2248)
Subject: RE: Algebra 1 (substitution method)
Math

Posts: 76
252525
Location: Henry Clay
I agree with you guys. Even when my alg 2 students used elimination on their exam when they were asked to use the substution method for a problem not solved for the variable. I had to take points off for not following instructions, but those were much easier using elimination that substitution.
acrowley
Posted 12/1/2008 7:54 AM (#2317 - in reply to #2248)
Subject: RE: Algebra 1 (substitution method)
Math

Posts: 25
25
Location: Lafayette
It definitely makes sense not to give the students too many examples where they have to solve for one of the varaibles first. Thanks for the idea!
slucas
Posted 12/19/2008 12:03 PM (#2352 - in reply to #2248)
Subject: RE: Algebra 1 (substitution method)


Math

Posts: 82
252525
Location: Lafayette
I agree, we will need to adjust the material if we are going to do it. I think we need to improve our consistency in this chapter. I did it with my double block where we already had the variable solved for and they did a lot better than my regular class.
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