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Optical Illusions - Finding the dy/dx for each

There are four optical illusions that are placed over a graph. In each graph depicted, an optical illusion is created by having lines intersect a family of curves. In each case, the lines appear to be curved. Please find the value of dy/dx for the given values of x and y and please show work involved so I can learn from it. I'm not understanding optical illusions! Thanks so much!! (See attached...I put them all in a 97 word doc).

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Solution Summary

Complete, Neat and Step-by-step Solutions are provided in the attached file.