Question

How do you convert `r cos(θ) = 9` to rectangular form?

Answer 1

`x=9`

Explanation:

We simply change `rcostheta` to `x`, since there are four identities:
`x=rcostheta`
`y=rsintheta`
`r^2=x^2+y^2`
`tantheta=y/x`

In this case we have:
`x=rcostheta=9`
`x=9`