Having Trouble with 3D Equation Curve, Please Help!

[fundk]

Im trying to create a perfect heart shaped surface. I found the formula of a heart’s surface online at  http://mathworld.wolfram.com/HeartSurface.html.  Math has never been one of my strengths, and Im having trouble figuring out how to input this formula (((x^2+(9/4)*y^2+z^2-1)^3)-x^2*z^3-(9/80)*y^2*z^3=0) in the way that Inventor can use it. I think it seems to require that the functions be interms of a single common variable for all axis (X, Y, Z, as a function of t). Unfortunatly, I don’t know how to get this formula expressed in terms of a single variable. Any help with this would be greatly appreciated! Also, does anyone know of any good concise recources that could help me get a better understanding of how to use the equation curve? I have just gone back to College and finished a 1st semester calculus course. Clearly I have alot further to go.