Find the slope of the tangent line to the curve of intersection of the vertical plane x-y+1= 0 and the surface z=x^2+ y^2 at the point (1, 2, 5) .
The Attempt at a Solution
Normal Vector 1 is i-j
Normal Vector 2 is 2i+4j-k
Cross them to get i+j+6k
then turn that vector into a unit vector and after that I am unsure what to do