The curve in the plane defined by the equation (*) (x^2 + xy + y^2 = 7) is a rotated ellipse, shown in the figure. a) Use implicit derivation to find dy/dx expressed by x and y. (b) Show that the curve passes through the point (2,1) and find the equation of the tangent line to the curve at the point (2,1).

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter7: Applying Fractions
Section7.5: Percents
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The curve in the plane defined by the equation (*) (x^2 + xy + y^2 = 7) is a rotated ellipse, shown in the figure.

a) Use implicit derivation to find dy/dx expressed by x and y.

(b) Show that the curve passes through the point (2,1) and find the equation of the tangent line to the curve at the point (2,1).

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