Question

Consider the following graph. Does the graph represent a function?

Answer 1

To check the graph is a function or not, use the vertical line test

Draw vertical lines in different positions on the graph, if any vertical line cuts the graph in more than 1 point, then the graph does not represent a function

Let us do that with the given graph

Since the graph is a circle, then the vertical line will cut it in 2 points

Then the graph