Posted by **-** on Sunday, October 19, 2008 at 8:13pm.

find points on the curve x^2+xy+y^2=7

(a) where the tangen is parallel to the x-axis and

(b) wehre the tangent is parallel to athe y-axis.

(in this case, dy/dx is not defined, but dx/dy is. what value does dx/dy have at these point?)

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