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Consider the function defined by f(x,y)=?x-y.(a) Find the domain and range of f.(b) Draw a contour map of f for k=-1,0, 1.(c) Sketch the graph

Consider the function defined by f(x,y)=?x-y.(a) Find the domain and range of f.(b) Draw a contour map of f for k=-1,0, 1.(c) Sketch the graph of f.

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