Originally Posted by

**againstthebes** Hello all,

I have two ellipses, both share the same origin, one is rotated relative to the other which is aligned with the coordinate system. For the unrotated ellipse, it is in the form Ax^2+By^2+F=0. The rotated ellipse has a similar form, but includes a rotational component of course: Ax^2+By^2+Exy+F=0. I am looking for the intersection points (there should be four) of these two ellipses. It is where the two equations are equal to one another. Setting these two equations equal to one another and simplifying yields something like: (B1-B0)y^2=-E1xy-(A1-A0)x^2. My question is how can I solve for both x and y to find these intersections? Is there a simpler manner? Thank you for any input.