August 31st, 2011, 08:01 PM  #1 
Newbie Joined: Aug 2011 Posts: 1 Thanks: 0  precalculus
I am a novice of precal 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, 06:25 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,716 Thanks: 1532 
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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