Chapter 10 - Conics, Parametric Equations, and Polar Coordinates - Review Exercises - Page 744: 76

$$y = 3$$

$$\eqalign{ & r = 3\csc \theta \cr & r = 3\left( {\frac{1}{{\sin \theta }}} \right) \cr & {\text{Multiply both sides of the equation by }}\sin \theta \cr & r\sin \theta = 3 \cr & {\text{Convert to rectangular form, using }}y = r\sin \theta \cr & y = 3 \cr & {\text{The equation represents a horizontal line}}{\text{.}} \cr & {\text{Graph}} \cr} $$