Solution: Find the equation of the normal to x^2+y^2=5 at the point (2, 1)

Problem Statement: ECE Board April 1999

Find the equation of the normal to x^2+y^2=5 at the point (2, 1).

• A. y = 2x
• B. x = 2y
• C. 2x + 3y = 3
• D. x + y = 1

Note: The slope of the line normal to the curve at the given point is equal to the negative of the reciprocal of the slope of the given curve.

Problem Answer:

The equation of the normal is equal to x = 2y

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