$\"\"$

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Observe the graph, the line passes through $\"\"$ and $\"\"$ .

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

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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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Point-Slope form of the line equation is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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The line equation is $\"\"$ .