Question

I need help changing r=3sin theta - 2costheta to rectangular form.

Answer 1

use
\[x^2+y^2=r^2 \\ r \cos(\theta) =x \\ r \sin(\theta)=y \\ \frac{y}{x}=\tan(\theta)\]

Answer 2

you only really need 3 of the mentioned

Answer 3

hint: multiply by r on both sides and what you should do next should be more obvious