Question

Use the "Show Your Work" button to show why this graph is not a function. Include a brief explanation to earn full credit.

I dont need to use the show your work thing I just need to know why this graph is NOT a function!

Answer 1

Explanation:

The reason "Why": The vertical line crosses given graph twice!!!

Answer 2

Answer is
(1) the vertical line test shows us the vertical line crosses two places meaning there are two of the same inputs. See attachment.
(2) you can see on the graph the coordinate points (4, 4) and (4, -4) showing there are two same inputs.

A function rule between an input and an output is that it assigns exactly one output to each input.