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# Find the equation of the line tangent to the curve x^2+y^2=25 ; (-3,4) at given point.

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We ban all bots. So I thought that since a tangent is always a straight line, I'd find the slope using the derivative. I don't even know why there's a y in the answer. What am I supposed to be doing?

Finding the derivative gets you the slope of the tangent line, not the tangent line itself. So this is just a formula to find the slope? That's a weird way for the book to write the answer though Your book wrote the equation of the line in its "general forn", which is perfectly alright.

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## Main Topics

The tangent of an angle is a ratio of the length of a leg opposite an acute angle to the length of a leg adjacent to the acute angle in a right triangle. It is one of the basic trigonometric functions, and is related to many real-world measures of angles and navigation.

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