a) Determine whether the given eqn is hyperbolic, parabolic or elliptic

b) Determine the subset of R^2

c) Determine the characteristics curves

a)

Hyperbolic if

ie

Elliptic if

ie

Parabolic if

ie

b) How do you write the subset query correctly?

c)

My initial attempt to solve for y on this by letting u = x^2 -1 and use substitution doesnt seem to work?

Thanks