Answer :
a=1 , c=9
y²/a²-x²/b²=1
c²=a²+b²
b²=c²-a²
b²= 9²-1²
b²=8
y²/1²-x²/8=1
y²- x²/8=1 is the equation of hyperbola.
y²/a²-x²/b²=1
c²=a²+b²
b²=c²-a²
b²= 9²-1²
b²=8
y²/1²-x²/8=1
y²- x²/8=1 is the equation of hyperbola.