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## Homework Statement

Question 2 from http://math.berkeley.edu/~mcivor/math53su11/solutions/hw6solution.pdf here.

I do not understand b) and e). How do I think of the slope with respect to y?

## Homework Equations

## The Attempt at a Solution

I do know that the partial derivatives are the slopes of the tanget lines. I do know that f

_{x}< 0 as the slope is negative there (at point P), but I do not understand how the slop in terms of y looks.