Respuesta :
It is a function because each x value only has one y value. None of the x values are repeating.
Hope this Helps!!
[tex]\bf \begin{array}{ccll} x&y\\ \cline{1-2} 1&\stackrel{1^3}{1}\\\\ 2&\stackrel{2^3}{8}\\\\ 3&\stackrel{3^3}{27}\\\\ 4&\stackrel{4^3}{64}\\\\ 5&\stackrel{5^3}{125}\\\\ x&x^3 \end{array}~\hspace{7em}\boxed{y=x^3}[/tex]