Homework Help: Polar Equations

1. May 16, 2013

Magnawolf

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$\theta$)? I'm not really sure at all.

3. The attempt at a solution

I also tried using x = rcos$\theta$ and y = r sin$\theta$ but I can't get anything. I know it's a hyperbola.

2. May 16, 2013

ehild

It is all right. How are r and θ related then?

ehild

3. May 16, 2013

Magnawolf

Inversely? I'm not sure!

4. May 16, 2013

ehild

No, why do you think so?

Just plug in x=rcosθ and y=rsinθ into the original equation xy=16.

ehild