Hello, I am having a problem with graphing an hyperbola in the equation of 4y^2/9 - 81x^2=1
I don't know how to set it up to be in the equation of y^2/a^2 - x^2/b^2=1
$\displaystyle \frac{4y^{2}}{9} - 81x^{2} = 1$
$\displaystyle \frac{y^{2}}{\frac{9}{4}} - \frac{x^{2}}{\frac{1}{81}}$
this is in the form of $\displaystyle \frac{y^2}{a^2} - \frac{x^2}{b^2} = 1$
where $\displaystyle a = \frac{3}{2} , b =\frac{1}{9}$
Can you graph now??