Question

How do you classify `xy = 4`?

Answer 1

`xy=4` is a hyperbola that has been rotated `45˚`.

graph{xy=4 [-22.35, 23.27, -10.32, 12.49]}

It is a rotation of the hyperbola `x^2/8-y^2/8=1`.

graph{x^2/8-y^2/8=1 [-32, 32.96, -15.16, 17.33]}