$\"\"$

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Slope of the two non vertical lines is $\"\"$ .

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Replace $\"\"$ in slope formula.

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$\"\"$

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$

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$\"\"$ (Cancel comman terms) \ \ $\"\"$

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The slope is $\"\"$ .