Find the points of any horizontal tangent lines of x^2+xy+y^2=6?

• Find the points of any horizontal tangent lines of x^2+xy+y^2=6?

Such tangent lines would be horizontal so ... How can I find the slope of the tangent line at each point of ... $x=2$ and find the tangent line?
Positive: 23 %
... of any horizontal tangent lines: (x^2+xy+y^2) = 6. Am I doing something wrong?\[x^2+xy +y^2 = 6 ... Find the points of any horizontal tangent ...
Positive: 20 %

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