Question

Which is the parametric form of the polar equation r=-7theta

Answer 1

The given polar equation is:

$r=-7\theta$

It is required to find the parametric form.

The parametric form of a polar equation is given as:

$\begin{gathered} x=r\cos\theta \\ y=r\sin\theta \end{gathered}$

Substitute r=-7θ into the equations:

$\begin{gathered} x=-7\theta\cos\theta \\ y=-7\theta\sin\theta \end{gathered}$Option A is the answer.