The function is $\"\"$ .

A direct variation is a relaionship in which the ratio of $\"\"$ to $\"\"$ is a constant .

Direct variation form of the function is $\"\"$ ,

Where $\"\"$ is a constant of variation.

Since $\"\"$ is not in the form of $\"\"$ , it is not a direct variation.

Hence $\"\"$ does not vary directly as $\"\"$ .