1. The problem statement, all variables and given/known data Find parametric equations of the tangent line at the point (-2,2,4) to the curve of intersection of the surface z=2x2-y2 and the plane z=4 2. Relevant equations Not sure 3. The attempt at a solution Not sure quite how to approach this. take the gradient of 2x^2-y^2 and just plug for x=rcos[tex]\Theta[/tex] and y=r sin[tex]\Theta[/tex] ? That seems too simple..