When something functions, that means it is working properly. The word "function" is new to us in math class, and the concept is a little difficult to understand at first.
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Imagine you are standing in line at the grocery store. You notice that the two
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The problem is quickly resolved. It had something to do with picking up the sodas from different parts of the store, and someone inputting a wrong code. You pay $3.21 and go on
your way.
For the most part, prices represent functions. For each input, there is only one output. For
each x, there is only one y. For each item, there is only one price. That doesn't mean a 12-pack of Coke must cost the same as a 12-pack of Pepsi. It just means that every 12-pack of Pepsi in the store must cost the same price. It is also okay for more than one item (x) to have the same price (y). It is okay for several y's to have the same x, as long as each x has only one y.
In the example on the left, the prices represent a function. Even though Mountain Dew costs the same as Pepsi, the rule is met: for each input, there
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