# Is #x=y^2-2# a function?

##### 2 Answers

Jul 9, 2018

No.

#### Explanation:

Because of a function's definition is that for any single

On the other hand, if you graph this, you can do the vertical line test. If you draw a vertical line and it intersects the equation more than once, then that equation does not represent a function.

Jul 9, 2018

NO. See below

#### Explanation:

A function is an aplication for which every single value of y, there is a single and only value of x.

Notice that for

But for

So, there are two values (2 and -2), for which the "function" gives the same value 2. Then it is not a function