Posted by nelly on Tuesday, January 10, 2012 at 12:15pm.
I do not know what the first one is supposed to be, either a typo or totally false
The second is true
the third has the signs backwards, should be (-3 ,2)
Looks like the first one is intended to be the equation of a circle.
(x^2 + ax) + (y^2 + by) = 0
Unfortunately, if a or b is not zero, there is no real graph.
If a=b=0, then the graph is just the point (0,0).
If there was a typo, giving a "d" on the right-hand side, then given suitable a,b,c,d there will be a circle that satisfies the equation.
Oh yes the first one was a typo it was supposed to be X^2+y^2+ax+by+c=0
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