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 August 31st, 2011, 09:01 PM #1 Newbie   Joined: Aug 2011 Posts: 1 Thanks: 0 precalculus I am a novice of pre-cal and having some problems with working out some problems determine whether the equations represent (y) as a function of (x) 1. x squared + y squared = 4 2. y = the square root 16 - x squared
 September 1st, 2011, 07:25 AM #2 Global Moderator   Joined: Dec 2006 Posts: 19,983 Thanks: 1853 1. No (unless it's known that x = 2). If, say, x = 0, y is not uniquely determined, as it could be 2 or -2. 2. Yes, if the possible values of x are known or implied. For any value of x, the equation uniquely determines the value of y.

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