### How to define a ~~map between variables over a ~~polynomial ~~ring~~A(x,y) that (x,y) satisfying y^2+y=x^3

I ~~try to define ~~am working on a ~~map between variables over a polynomial ring ~~elliptic curve like ~~x^2=y^3+y~~

to a polynomial like `x^2*yy^2+y=x^3`

~~I have try this
~~and i want to define a polynomial ~~
F=PolynomialRing(GF(2^6),'x,y')~~A(x,y)

~~ ~~ that ~~x,y=F.gens()~~x,y

~~ ~~ satisfying ~~Func=x^2*y
Func(x=(y^3+y)^(1/3))
~~y^2+y=x^3

But it doesn't work

Hope to get your help, thank you!