Question

This graph is a function?​

Answer 1

The x value of a point where a vertical line intersects a function represents the input for that output y value. If we can draw any horizontal line that intersects a graph more than once, then the graph does not represent a function because that y value has more than one input.

Answer 2

There is no graph, but unless the x value of the live repeats, yes, it is a function.

Explanation: