curva piriforme, cartesiana

h^2 * y^2 = x^3 (k-x)

h = 2 (slider from -5 to 5, step 0.1)
k = -4.6 (slider from -5 to 5, step 0.1)
a: h^(2) * y^(2) = x^(3) * (k - x)