Find the equation of the tangent line at the given value (in form Ax+By+C=0) Implicit Differentiation must be used:

If you could show me the steps, as well, that would be great... yet again, i'm totally lost.

a) x^2 y^3 = 8 ; (-1,2)

b) y^3 + xy - y = 8x^4 ; x = 1

thanks again, guys :-/