Posted by Knights on Saturday, March 9, 2013 at 9:57am.
The standard equation for a circle is ...
(x-a)^2 + (y-b)^2=r^2
Lets play with your equation.
x^2+y^2-2x-2y=0
x^2-2x + 1 + y^2-2y+1= 2 That wont work. We do have perfect squares on the left, but there is needed a zero on the right. Hmmm It is not a circle.
Lets look at if y is y<=0
if y is zero, then
x^2=2x or x can be any real number up to infinity, and there can be no larger x. So the answer is x=inf is the largest real number. Yes, y=0 is a real number.
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