Surjective Morphism

Let V=Z(xz-y^2, yz-x^3, z^2-x^2y) in A^3.
Prove that map b:A^1 -> V defined by b(t)=(t^3, t^4, t^5) is a
surjective morphism.

I stared by assuming that if (x,y,z) != (0,0,0) then t=x/y.
What happens next?

.