1. The problem statement, all variables and given/known data Write the polar equation for the graph y = x. 2. Relevant equations [tex]x = r cos \theta [/tex] [tex]y = r sin \theta [/tex] 3. The attempt at a solution I came up with [tex]\theta = \pi/4[/tex] because at [tex]\pi/4[/tex], the x and y coordinates match each other. I'm not sure this is correct, though.