Question

Rewrite the Cartesian equation x = -5 as a polar equation.

Answer 1

\[x = r\cos(\theta)\]

Answer 2

Yeah! that's what I got but I need to have it in the form r(theta) and when I did that, I got r=-cos(theta)/5 and it was wrong...

Answer 3

\[x=-5\\r\cos(\theta)=-5\\r=-\frac{5}{\cos(x)}=-5\sec(x)\\r=-5\sec(\theta)\]

Answer 4

perfect, thanks!

Answer 5

\[x=-5\\r\cos(\theta)=-5\\r=-\frac{5}{\cos(\theta)}=-5\sec(\theta)\\r=-5\sec(\theta)\]

Answer 6

sorry typos, i had x's where theta should be

Answer 7

np