Answer
(2,8) is a solution.
Work Step by Step
We are given that $y=x^{3}$.
In order to see whether each ordered pair is a solution of the given equation, we can plug in the ordered pair to the equation.
For (2,8): $2^{3}=2\times2\times2=8$
So, (2,8) is a solution.
For (3,9): $3^{3}=3\times3\times3=27\ne9$
So, (3,9) is not a solution.