Ex: Determine if a Function is Increasing or Decreasing in a Direction Using a Contour Map

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This video explains how to determine if a function of two variables is increasing or decreasing in a specific direction from a given point.
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But y only decreases in the y-negative direction until reaching y=0 where all othe y-negative values would cause it to increase beyond y=0. So how do you know that "decreasing is the correct answer here?

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