sorry for that some typing mistake.
the solution shuld be:solution:Insisting that the graph of a(x2+y2)+bx+cy+d = 0 passes through the three points
gives a homogeneous linear system of three linear equations in four variables. This has a
nontrivial solution, and a = 0 would be the three...
I have some difficulties to understand the logic of the solution to this problem.
Q:The graph of a(x2 +y2)+bx+cy +d = 0 is a circle if a 6= 0. Show that there
is a circle through any three points in the plane that are not all on a line.
solution:Insisting that the graph of...