# Algebra

Write an equation for the following situation.

Polly Gone has \$120 saved already. She wants to save for airfare to visit her friend. The airfare will cost \$500 and she can save \$60 per week. How many weeks will it take her to save enough money for the airfare?

(Hint: The goal is to write the equation so that it models the situation, not to solve it!)

Equation that solves the problem: (500-120)/60=x

Equation that models the problem: ??????????

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1. Time needed = (500-120)/60

What's with all this "model the problem" stuff.
You make a statement such as

Time needed = (500-120)/60

work it out, and you are done.

Introducing variables like x is not necessary, and asking for an "equation" results in abuse of the concept of equations.

It is this unnecessary complication of a simple arithmetic problem that must drive students crazy (and I hope most teachers)

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posted by Reiny

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