I am having a brain fade today, and just really need to make sure I am doing this correctly.

i am given ... Convert the rectangular equation x^2 + y^2 - 2y = 0

I think the answer is -2sin(theta) however I am missing a step to proove it.

and one other one on the reverse side... convert polar to rectangular

r = (2/(2sin(theta) - 3cos(theta)))

I am lost on that one.

any help is greatly appreciate