How can I solve an algebraic word problem containing two unknowns using just one variable?

How can I solve an algebraic word problem containing two unknowns using a system of equations?

What questions can I ask myself to help complete algebraic word problems containing two unknowns?

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(October 15, 2012) Professor Keith Devlin looks at how algebra, one of the most foundational concepts in math, was discovered. Originally presented in the Stanford Continuing Studies Program. Stanford University: http://www.stanford.edu/ Stanford Continuing Studies Program: https://continuingstudies.stanford.edu/ Stanford University Channel on YouTube: http://www.youtube.com/stanford

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