Taking the vertex of the major axis of the ellipse with 25 / x square plus 9 / y square equal to 1 as the focus, the hyperbolic equation with the focus as the vertex is?

Taking the vertex of the major axis of the ellipse with 25 / x square plus 9 / y square equal to 1 as the focus, the hyperbolic equation with the focus as the vertex is?

16 x squared minus 9 y squared equals 1