$\"\"$

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$\"\"$ The formula for slope is $\"\"$ .

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The points are $\"\"$ and $\"\"$ .

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Substitute $\"\"$ for $\"\"$ , $\"\"$ for $\"\"$ , $\"\"$ for $\"\"$ and $\"\"$ for $\"\"$ in above formula.

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$\"\"$

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$\"\"$

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The slope is $\"\"$ .

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$\"\"$

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$\"\"$ $\"\"$ .

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If $\"\"$ increases by $\"\"$ units, $\"\"$ will decrease by $\"\"$ unit.

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$\"\"$

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$\"\"$ The slope is $\"\"$

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$\"\"$ If $\"\"$ increases by $\"\"$ units, $\"\"$ will decrease by $\"\"$ unit.