Question: Use a graphing utility to graph the curve 11x 2 + 4xy + 14y 2 = 21. Draw the tangent line to the curve at

Use a graphing utility to graph the curve 11x² + 4xy + 14y² = 21. Draw the tangent line to the curve at (−1, 1). How many horizontal tangent lines does the curve have? Find the equation of each horizontal tangent.

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