This is an example of the solution of multiple hyperbolas using Ceres.js as part of a passive TDOA triangulation algorithm.
solveEquations( [
8.43864x^2 - 12x y + 3.43864y^2 + 17.43864x - 11.15797y = -8.98031,
-10.7316x^2 + 24x y - 3.7316y^2 + 3.4632x - 18.4026y = -11.6665 ,
-34.48329x^2 + 1.51671y^2 + 34.48329x = 5.35201
] )
The correct answer in this example should be exactly (2,7).