# Find the Cartesian Form of ?

1. Jan 1, 2013

### qablos

Find the Cartesian Form of

r(1+sinθ)=a

I understand that:
x=rcosθ
y=rsinθ
and r2=x2+y2

I can get quite far to the point I end up with

x2=a2-2ay

I'm struggling to eliminate "a"...

2. Jan 1, 2013

### Dick

You can't eliminate a. I think you are already done.

3. Jan 1, 2013