$\"\"$

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The equation is $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The slope of the normal line is perpendicular to the slope of the tangent line.

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Slope of tangent line $\"\"$ Slope of normal line is equal to $\"\"$ .

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Then Slope of the normal line

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$\"\"$ .

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The slope of the normal line is $\"\"$ .

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$\"\"$

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

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Consider the point $\"\"$ then line equation is $\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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When the linear equation is $\"\"$ passes through the origin then the value of $\"\"$ .

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The equation passing through origin is $\"\"$ .

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$\"\"$

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The normal line of the equation $\"\"$ is passes through the origin at any point.