For the given table of values, determine whether the function is a direct variation function, an inverse variation function or neither. Justify your answer. If it is a variation function, write down the equation of the function.

$\begin{array}{|ccccc|}\hline x& -2& 0& 3& 4\\ y& 20& 0& 45& 80\\ \hline\end{array}$

For the given table of values, determine whether the function is a direct variation function, an inverse variation function or neither. Justify your answer. If it is a variation function, write down the equation of the function.

$\begin{array}{|ccccc|}\hline x& 2& 4& 6& 12\\ y& 30& 15& 10& 5\\ \hline\end{array}$

For the given table of values, determine whether the function is a direct variation function, an inverse variation function or neither. Justify your answer. If it is a variation function, write down the equation of the function.

$\begin{array}{|ccccc|}\hline x& -2& 0& 2& 5\\ y& -0.5& \text{ undefined }& 0.5& 0.032\\ \hline\end{array}$

For the given table of values, determine whether the function is a direct variation function, an inverse variation function or neither. Justify your answer. If it is a variation function, write down the equation of the function.

$\begin{array}{|ccccc|}\hline x& 1& 2& 4& 9\\ y& 40& 22& 13& 8\\ \hline\end{array}$

When $x=2,y=12$. Find the value of $y$ when $x=4$ if: $y$ varies directly as $x^2$.

When $x=2,y=12$. Find the value of $y$ when $x=4$ if: $y$ varies directly as $x^3$.

When $x=2,y=12$. Find the value of $y$ when $x=4$ if $y$ varies inversely as $x$.

When $x=2,y=12$. Find the value of $y$ when $x=4$ if: $y$ varies inversely as $x^2$.

$y=24$ when $x=5$, Find the value of $x$ when $y=2$ if $y$ varies directly as $x$.