An elliptical equation is in the form Ax^2+Bx+Cy^2+Dy+E=0 the equation is a Hyperbola. When x and y are both squared, and exactly one of the coefficients is negative and exactly one of the coefficients is positive. 1-49x^2-98x-64y^2+256y-2831=0 2-4x^2+32x-25y^2-250y+589=0 3-81x^2+512x-64y^2-324y-3836=0