Question

{(2,4) (3,9) (4,9)} is this a function?

Answer 1

Yes, considering the points, each input gives one output. Points would not be a function if the same input gave different outputs.

In the context of a graph, the points would be on the same vertical line.

Hope this helps.

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Answer 2

Yes

Explanation:

A function is where there are no two of the same domain.

The Domain is the first coordinate which is x