$\"\"$

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Let the points are $\"\"$ .

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$\"\"$ (Slope: $\"\"$ )

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$\"\"$

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$\"\"$

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$\"\"$ (Apply slope formula: $\"\"$ )

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$\"\"$

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$\"\"$

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$\"\"$

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The inclination $\"\"$ . $\"\"$

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The inclination $\"\"$ .