1. The problem statement, all variables and given/known data Find the equations of the tangent plane and the normal line to the given surface at the specified point. xy+yz+zx=3 @ (1,1,1) 2. Relevant equations z-z0=fx(x0,y0)(x-x0) + fy(x0,y0)(y-y0) 3. The attempt at a solution I feel like this should be really easy, but I'm not sure how to get started. the equation from the book for the tangent plane seems to imply I should isolate z from the equation and go from there, but that seems like it would make things messy and more complicated than necessary.