Find the domain and range of the relation and determine whether it is a function.
Domain: positive integers; range: positive integers; no, it is not a function.
Domain: x > 3; range: y > 0; yes, it is a function.
Domain: all real numbers; range: all real numbers; yes, it is a function.
Domain: x ³ 0; range: y > 3; no, it is not a function.

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