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no, but y = x2 is a function
A function is not a function if it passes through the vertical line test more than once, and it is not linear or a quadratic.
If the domain is infinite, it is not possible to list the function.
No. One argument of function may have only one value. So, if it has more than one value, it is not a function.
A function is not a function if it passes through the vertical line test more than once, and it is not linear or a quadratic.