Question: (a) Determine y' given y x = x y . (b) Find the slope of the tangent line to the graph of y x =

(a) Determine y' given yx = xy.
(b) Find the slope of the tangent line to the graph of  yx = xy at each of the following points.

(i) (c, c) 

(ii) (2, 4) 

(iii) (4, 2)
(c) At what points on the graph of yx = xy does the tangent line not exist?

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