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Find the slope of the tangent line to the curve defined by \( x^{4}-7 x y+9 y ...
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Find the slope of the tangent line to the curve defined by \( x^{4}-7 x y+9 y^{3}=-85 \) at the point \( (-1,-2) \). The slope of the curve at the point \( (-1,-2) \) is