Tangent Lines to a Conic Section

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Suppose that is a point on the conic section
. Then the tangent line to the conic section at point
is
Contributed by: Soledad María Sáez Martínez and Félix Martínez de la Rosa (March 2011)
Open content licensed under CC BY-NC-SA
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Reference: S. H. Kung, "Finding the Tangent to a Conic Section without Calculus," The College Mathematics Journal, 34(5), 2003 pp. 394–395.
Permanent Citation
"Tangent Lines to a Conic Section"
http://demonstrations.wolfram.com/TangentLinesToAConicSection/
Wolfram Demonstrations Project
Published: March 7 2011