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 3*x* 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 3*x* 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.

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