180 Days of Ideas for Discussion in Math Class.
(as of 9July2014, we're in overtime!)
Nice. I wonder how much harder this is for students when presented without the choices?Joshua3jlearneng.blogspot.com
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I feel a little dumb because I went through all the torture of solving for a using the quadratic formula and then plugging it in the second equation and simplifying, and then, when I checked my work by starting with the second equation, realized how easily it came out. Doh!