Posted by Anonymous on Sunday, November 18, 2007 at 12:46am.
leave your derivative as
dy/dx = (2x-6)/(-12y) after you differentiated implicitly.
then (2x-6)/(-12y) = 0 can only be true if
2x-6 = 0
x = 3 now put that back into the original equation to get y = ...
your equation will be y = that value
would it by (2,sqrt(10)/2)?
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