The curve r(t) passing through the point is defined implicitly by the equations:

x^2y + y^2x + xyz + z^2 = 4

x + y + z = 3

i) Find the equation of the tangent line to this curve at the given point.

ii) Assume that we may choose x = t as the parameter. Find formulae for dy/dt and d^2y/dt^2.

I'm not sure how to tackle these questions. For i), can I use either of the two equations?