Please solve these problems thank you!

Problem I. Find the slope of the tangent at the point ( 2, 2, 4) on the curve that intersects the surface 252= 92+ 167 2 and the Plane = 2 . Problem2 . "(xcry ) = excosy , show that it Satisfies Laplace's equation. Problem 3 . Find the equation of tangent Plane to the Surface forcry) = 2x2tyz at the Point ( 1 , 1 1 3)