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Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. Please edit your question to include words for symbols and any other relevant detail.
However, if the equation is y = x^2 + 3 then it is a function.

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Q: Is the equation yx2 3 a function?
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Is yx2 2x-3 a linear equation?

"y x 2 2x -3 is not any kind of equation because it does not have an equals sign (=).


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You can tell if an equation is a function if for any x value that you put into the function, you get only one y value. The equation you asked about is the equation of a line. It is a function.


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