# Polar equation of a simple parametric

1. Sep 8, 2010

### Exeneva

1. The problem statement, all variables and given/known data
Write the polar equation for the graph y = x.

2. Relevant equations
$$x = r cos \theta$$
$$y = r sin \theta$$

3. The attempt at a solution

I came up with $$\theta = \pi/4$$ because at $$\pi/4$$, the x and y coordinates match each other. I'm not sure this is correct, though.

2. Sep 8, 2010

### rock.freak667

Yes, that should be correct.