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Multivariable & Vectoreasy
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The gradient of a function f(x,y)f(x,y)f(x,y) at the point (1,2)(1,2)(1,2) is ∇f(1,2)=⟨3,−1⟩\nabla f(1,2) = \langle 3, -1 \rangle∇f(1,2)=⟨3,−1⟩. What is the slope of the surface z=f(x,y)z = f(x,y)z=f(x,y) at (1,2)(1,2)(1,2) in the positive yyy-direction?