The horizontal parabola can be related to the functions:
y = √x and y = -√x.
What kind of function it could be?
Remember that for a function each input has a single output.
In the case of a horizontal parabola, the general case is:
x = y^2
The problem here is that the input x = 4 can be mapped into two different outputs, that are y = 2 and y = -2, so this is not a function.
Now, this can be related to a function? yes.
We could rewrite:
y = √x
Which is in did a function.
The actual decomposition would be:
y^2 = x ⇒ y = ±√x
Such that:
y = √x and y = -√x
Are functions, but:
y = ±√x and y^2 = x
Are not functions.
y^2 can be related to square root functions.
If you want to learn more about parabolas:
https://brainly.com/question/4061870
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