Answers

2014-08-25T15:24:27+08:00
2014-08-25T16:27:15+08:00
1. (-2,3),(1,2),(0,2) 
2. x+y^2=4
3. (3,4),(2,3),(1,3)

PS.: always remember that a function doesn't repeat its abscissa (x-axis). Hope these helps!
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