et a and y be real variables related by the equation r = y. (a) Does this relationship represent y as a function of a? Justify your answer. (b) Suppose we restrict y 2 0. With this restriction, does this relationship represent y as a function of r? Explain why or why not. (c) Is there any way to restrict both a and y to make this relationship represent y as a one-to-one function of æ? If so, what is the restriction? If not, explain why.

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