Question 856520
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
x^2+y^2-10y+9=0  |completing the Square to put into standard form
x^2 + (y-5)^2 -25  +9 = 0
x^2 + (y-5)^2 = 16
x^2 + (y-5)^2 = 4^2  Circle:  C(0,5)  r = 4
{{{drawing(300,300,   -10,10,-10,10, 
 grid(1),
circle(0, 5,4),
circle(0, 5,0.4),
graph( 300, 300, -10,10,-10,10))}}}