$\"\"$

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Substitute $\"\"$ in slope formula.

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$\"\"$

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$\"\"$

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$\"\"$

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Multiply each side by negative 4.

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$\"\"$

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$\"\"$

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$\"\"$

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Subtract 3 from each side.

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$\"\"$

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$\"\"$

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Multiply each side by negative one.

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$\"\"$

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$\"\"$

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$\"\"$

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The value of r is $\"\"$ 17.