The table represents y as a function of x.
To justify this let's remember the definition of function:
A function from a set X to a set Y assigns to each element of X exactly one element of Y.
In this case we notice that for each element x their corresponding value of y is the fourth power, that is, we can relate the variables by the equation:
[tex]y=x^4[/tex]
Now, since we only have one output for every input we fulfil the second part of the definition and hence we conclude that the table is representing a function.
