# x^2+y^2-2y=0 ??

• Jan 3rd 2013, 07:03 AM
antar141993
x^2+y^2-2y=0 ??
please can i know what is this equation x^2+y^2-2y=0
its not a circle nor a parabola
• Jan 3rd 2013, 07:27 AM
skeeter
Re: x^2+y^2-2y=0 ??
Quote:

Originally Posted by antar141993
please can i know what is this equation x^2+y^2-2y=0
its not a circle nor a parabola

$x^2+y^2-2y+1 = 1$

$x^2 + (y-1)^2 = 1$

yes, it's a circle centered at $(0,1)$
• Jan 3rd 2013, 07:30 AM
antar141993
Re: x^2+y^2-2y=0 ??
thank you
i should've add a +1 and -1 ;)