I need help with these two problems! I keep working them out and getting wrong answers! BAH!

1.) Use implicit differentiation to find the equation of the tangent line to the curve http://webwork1.math.utah.edu/math12...286086img1.gif at the point http://webwork1.math.utah.edu/math12...286086img2.gif. The equation of this tangent line can be written in the form http://webwork1.math.utah.edu/math12...286086img3.gif where http://webwork1.math.utah.edu/math12...286086img4.gif is:

and where http://webwork1.math.utah.edu/math12...286086img5.gif is:

AND

I keep got 0 for this one and its not right! :S

If http://webwork1.math.utah.edu/math12...286086img1.gif and http://webwork1.math.utah.edu/math12...286086img2.gif, find http://webwork1.math.utah.edu/math12...286086img3.gif by implicit differentiation.