$\"\"$ $\"\"$

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The slope formula is $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Product of two same signs is positive)

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Apply Additive inverse property: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The slope of $\"\"$ .