# Math Help - Tangent Plane

1. ## Tangent Plane

If you have a surface with the partial derivatives dz/dx = 2, and dz/dy = 4, at (1,2,5). Is the point (3,6,6) on the tangent plane?

2. Originally Posted by jenius
If you have a surface with the partial derivatives dz/dx = 2, and dz/dy = 4, at (1,2,5). Is the point (3,6,6) on the tangent plane?
the tangent plane here is: $z = 2x + 4y - 5$

does this plane contain (3,6,6)?