How to find whether lines are parallel -...

Line P passes through the origin and point $\left ( $\frac{1}{9}$ , $\frac{1}{7}\right)$ .

Line Q passes through the origin and point $\left( $\frac{1}{9}$ , -$\frac{1}{7}\right )$ .

Line R passes through the origin and point $\left ($\frac{1}{7}$, $\frac{1}{9}$ \right )$ .

Line S passes through the origin and point $\left ($\frac{1}{7}$, -$\frac{1}{9}$ \right )$ .

Which of these lines is parallel to the line of the equation ?

How to find whether lines are parallel Practice Test