Posted by **Bob** on Wednesday, November 17, 2010 at 9:52pm.

f(x,y)=x^2+2y^2

use the gradient vector f(5, 1) to find the tangent line to the level curve f(x, y) = 27 at the point (5, 1).

answer choices:

1. 10x + 4y = 27

2. 2x + 4y = 27

3. 5x + 2y = 27

4. 10x − 4y = 27

5. 5x − 2y = 27

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