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Fxy in a contour graph, positive or negative?

  1. Nov 13, 2012 #1
    1. The problem statement, all variables and given/known data
    d=1352846320 xx.png

    The question asks for fxy.
    The rate of change of (the rate of change of f in the x direction) in the y-direction.

    We know fx is negative because as f moves in the x-direction, f decreases. But how do I know the rate of change of fx in the y-direction? Any idea?

  2. jcsd
  3. Nov 13, 2012 #2


    Staff: Mentor

    What is being shown in the graph? Are these level curves for z = f(x, y)?

    f is not moving. A point (x, y) in the plane is moving, which results in different values of something. I can't tell what "something" is, because your graph has no labels that would help me understand what it is conveying.
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