Algebra 41 - Using Systems of Equations Versus One Equation

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When should a system of equations with multiple variables be used to solve an Algebra problem, instead of using a single equation with a single variable?
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One of the most eloquent explanations of this topic that I have ever heard. Thank you, again.

alexh.
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Do you recognize the two groups of movie-goers at 11:01?

MyWhyU
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What makes define width, length and height ?
which one is which ? i am so confused. because all these concept is depends on the point where  are look at it.  can you help me ?

hanscenica