$\"\"$

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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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Hence (slope of the tangent line)(slope of the normal line) is equal to $\"\"$ .

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Then Slope of the normal line $\"\"$ .

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The slope 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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Observe the equation $\"\"$ ,the equation is passes through the origin.

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$\"\"$ .

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