If one x-value maps to many y-values, does the relation represent a function?

No

Step-by-step explanation:

This is the general rule for any function, where a function cannot have more than one x value for every y value, there is only one output for every input.

You can also use the vertical line test which states that anything that hits the line more than once is not a function.

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)