# Thread: Gradient

1. ## 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)

2. 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 $\nabla \Phi (2, - 1)\text{ where } \Phi = x^2 + 3y^2 - 7$.