Thread: Gradient

Can anyone help please,

Find the normal line to the level curve of the surface given by
x^2 + 3y^2 = 7 at the pointM(2,-1)

Originally Posted by sonia1

Find the normal line to the level curve of the surface given by x^2 + 3y^2 = 7 at the pointM(2,-1)

The direction vector of the line is $\displaystyle \nabla \Phi (2, - 1)\text{ where } \Phi = x^2 + 3y^2 - 7$.