# Math Help - Cartesian coordinates (Conversion)

1. ## Cartesian coordinates (Conversion)

I have to lean how to convert the following equation to Cartesian coordinates:
r sin q = -2

Is there a formula I can use to do this? I am having a hard time finding information on google on how to do it.

Thanks for any help

PS- I am not sure what topic this falls under. :-/

2. ## converting polar equation to rectangular coordinates

I am a bit rusty on this but I think I know how to do it:

Try to find rcos(theta) or rsin(theta) in the equation and replace it with x or y and replace r2 with x2+y2. Often you will have to multiply both sides by something so that you can find these expressions.

In this case r sin q = -2

r sin(q) = -2

y = -2

Am I right anyone?

3. these are the formulas:
x=rcos(theta)
y=rsin(theta)
r^2 = x^2 + y^2

4. Originally Posted by Math Help
y = -2

Am I right anyone?
Yes, this is OK