Let's plot the line with equation \(x=5\text{.}\) (Note that this is the same as \(1x+0y=5\text{.}\))

The line has \(x=5\text{,}\) so to plot points, we are required to move over to \(x=5\text{.}\) From there, we have complete freedom to move however far we like up or down.

A line like this is vertical, parallel to the vertical axis. All lines with an equation in the form

\begin{equation*} x=h \end{equation*}

(or, in standard form, \(Ax+0y=C\)) are vertical.

a vertical line at x=5