$\"\"$

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The equation is $\"\"$ .

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

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The equation is $\"\"$ .

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

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Subtract 3x from each side.

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$\"\"$

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$\"\"$

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Divide each side by negative 7.

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$\"\"$

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$\"\"$

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

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The equation is $\"\"$ .

\

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

\

Subtract 3x from each side.

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$\"\"$

\

$\"\"$

\

Divide each side by negative 7.

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$\"\"$

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$\"\"$

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

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The option C is correct answer.