4. The graph of the equation y = y-x is shown at right. dy (a) Verify that 2.x Show the work that leads to your answer. dx 2y-4y 0.5 -0.6-0.4-0.2 0.2 0.4 0.6 -0.5 (b) Find the point(s) (x, y) at which the graph has a horizontal tangent line. Show the work that leads to your answer. Graph enerated by Walframtiphu (c) Find the y-value(s) which the graph has a vertical tangent line. Show the work that leads to your answer.

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A: solution of the given question is like this:

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