Answer
The statement makes sense.
Work Step by Step
When we convert an equation from polar form to rectangular form, then the obtained rectangular equation may not define y as a function of x.
For example, let us consider the polar equation $\theta =0$. Its rectangular equation is given by
$\begin{align}
& \tan \theta =\frac{y}{x} \\
& y=x\tan \theta \\
& y=x\left( 0 \right) \\
& =0
\end{align}$
This rectangular equation is
$y=0$
From the equation, we can see that after conversion from polar form to rectangular form the rectangular equation has not defined y as a function of x.
