Which of the following relations [(a), (b), (c)] are functions of x? Explain. (a) (b) x y

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Which of the following relations [(a), (b), (c)] are functions of x? Explain.

(a)

(b)  x                      y

 1                            3

–1                           3

 4                            2

(c) y = ±√x2 – 1

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