Question: Which of the following determine a function f with formula y = f (x)? For those that do, find f(x). (a) x2 + y2 =

Which of the following determine a function f with formula y = f (x)? For those that do, find f(x).
(a) x2 + y2 = 1
(b) xy + y + x = 1, x ≠ - 1
(c) x = √2y + 1.
(d) x = y/y + 1

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