In the graph given below, line $LM$ is parallel to the $y$-axis.

Write the co-ordinates of the points $P, Q$ and $R$.

In the graph given below, line $\mathrm{LM}$ is parallel to the $y$-axis.

What is the difference between the $x$ co-ordinates of the points $\mathrm{L}$ and $\mathrm{M}$?

How many lines are there which are parallel to $x$-axis and have a distance $5$ units? Explain.

If $\text{'}a\text{'}$ is a real number, what is the distance between the $y$-axis and the line $x=a$?