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For all the following, which ones represent y as a function of x, and how do you know?
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For all the following, which ones represent y as a function of x, and how do you know?

For all the following, which ones represent y as a function of x, and how do you know-example-1
User Francesco Casula
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Only 25 and 28 are functions.

A function must have only one y value per x value. For 26, the y value of 0 and multiple others have two different y values. For 27, all x values less than 0 have multiple y values.
User Vpekar
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