Real Numbers (Natural ones) Rock

Posted on March 18, 2015

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Trying to get slope intercept form of an equation and the student asks me what gives me the mathematical right to move that five x to the other side.

So I explained about equality… doin’ the same thing to both sides means they’re still the same… but that is a little extra abstract… so I tossed in that 10 + 11 = 21 — and 10 = 21 – 11.   It helped … and it facilitates understanding the abstract.

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