$\"\"$

\

The equation is $\"\"$ .

\

The equation $\"\"$ does not adjusted in the form $\"\"$ , so it does not represent a direct variation.

\

The equation is $\"\"$ .

\

Rewrite the equation $\"\"$ in the form $\"\"$ by solving for y.

\

Subtract 3x from each side.

\

$\"\"$

\

$\"\"$

\

Divide each side by negative 7.

\

$\"\"$

\

$\"\"$

\

The equation $\"\"$ cannot be rewritten in the form $\"\"$ , so it does not represent a direct variation. $\"\"$

\

The equation is $\"\"$ .

\

Rewrite the equation $\"\"$ in the form $\"\"$ by solving for y.

\

Subtract 3x from each side.

\

$\"\"$

\

$\"\"$

\

Divide each side by negative 7.

\

$\"\"$

\

$\"\"$

\

The equation $\"\"$ can be rewritten in the form $\"\"$ , so it represents a direct variation. $\"\"$

\

The option C is correct answer.