Ex: System of Equations Application - Coin Problem

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This video explains how to solve an application problem using a system of equations.
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Mr. Sousa, you are the man! I've passed ALL my college math classes (so far) with the use of your great videos-Pre-Calc, Calc I, II, III, Linear Alg, Diff Eq, and Probability/Data Analysis. You are a wonderful teacher, and I thank you humbly for your videos. I've developed such a fondness for mathematics that I've chosen it as a minor thanks to teachers like you. As a guy who has never liked, nor been any good at math historically, I'm extremely grateful there are people like you out there. Thank you, thank you, thank you!

Now, if only I could speel....

williampayson
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how is 21 minus -12 is 9? Isn't it 33? Or idk

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