23. The equation y2 - x2 = 1 represents which conic section?hyperbolaellipsecircleparabola

The standard equation for a hyperbola with a vertical transverse axis is
[tex]\frac{(y-k)^2}{a^2}\text{ - }\frac{(x-h)^2}{b^2}\text{ = 1}[/tex]The centre is at (h,k)
Hence the equation
[tex]y^2-x^{2^{}}=\text{ 1}[/tex]Represents hyperbola.
Therefore the correct answer is Hyperbola