Question: Sketch the curve (x, y) = c together with and the tangent line at the given point. Then write an equation for the tangent

Sketch the curve ƒ(x, y) = c together with ∇ƒ and the tangent line at the given point. Then write an equation for the tangent line.

x2 - xy + y2 = 7, (-1, 2)

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