1. The problem statement, all variables and given/known data Find a polar equation with the graph as xy=16 2. Relevant equations r = ed/(1+- cos[itex]\theta[/itex])? I'm not really sure at all. 3. The attempt at a solution I also tried using x = rcos[itex]\theta[/itex] and y = r sin[itex]\theta[/itex] but I can't get anything. I know it's a hyperbola.