Question 847569
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
(6,-6) (3,-7) (3,3). 
(3,-7) (3,3)  &#8658; x = 3   and as -7 + 3 = 10, c = 5
{{{(x-3)^2 + (y+b)^2 = 5^2}}} &#8658; {{{ b = -2}}}    as 3-(-2) = 5
{{{(x-3)^2 + (y+2)^2 = 5^2}}} 
{{{drawing(300,300,  -10,10,-10,10,   grid(1),
circle(6, -6,0.2),
circle(3, -7,0.2),
circle(3, 3,0.2),
circle(3,-2,5),
circle(3,-2,0.2),
graph( 300, 300, -10,10,-10,10) )}}}