One version of the Folium of Descartes is given by x³ + y² = 1.4xy for what value(s) of x is the slope of the tangent line vertical? a. 1.4000y^2 b. -0.7143y^2 c. There is no place where the Folium has a vertical tangent d. -0.7143y e. 2.1429y^2

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