# How do I find the polar equation for y = 5?

We can easily convert equations from cartesian coordinates to polar coordinates by making the substitutions $x = r \cdot \cos \left(\theta\right)$ and $y = r \cdot \sin \left(\theta\right)$. Therefore, the equation $y = 5$ will be rewritten as $r \cdot \sin \left(\theta\right) = 5 \to r = \frac{5}{\sin} \left(\theta\right)$//
$x = r \cdot \cos \left(\theta\right)$
$y = r \cdot \sin \left(\theta\right)$