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Mathematics 21 Online
OpenStudy (anonymous):

Attachment help Which is not a function?

OpenStudy (anonymous):

OpenStudy (mathstudent55):

Each x-coordinate can have only one y-coordinate to be a function. Any relation that uses the same x-coordinate in two or more different points is not a function.

OpenStudy (anonymous):

so the third one? @mathstudent55

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