The given expression is,
[tex]3x=-12[/tex]
Divide both sides of the above equation by 3. (Dividinng the equation by a constant does not affect the equation).
[tex]\begin{gathered} x=\frac{-12}{3} \\ x=-4 \end{gathered}[/tex]
Now, we plot x=-4 in the graph.
So, the graph of equation 3x=-12 is a vertical line passing through x=-4.
