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Explain how you decide which part of a problem will be represented by the variable x, and which part will be represented by the variable y in the graph of the situation.

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generally the independent variable (the one you change) is x and the dependent variable is y

User Pquest
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You have to analyze the problem, to find out what is the dependent variable, which is y. Also, what unit is the independent variable which is x.
User Kit Plummer
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