Say the points

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$\"\"$

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$\"\"$

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Line equation is $\"\"$ .

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Substitute the values $\"\"$ and $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Multiply 3 to each side

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$\"\"$

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Apply distributive property : $\"\"$

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$\"\"$

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Subtract $\"\"$ from each side

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$\"\"$

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Line equation is $\"\"$ .