Chapter 2 Linear Equations and Functions - Chapter Review - Exercises - Page 142: 14

See graph

We have to graph the function: $$x=4.$$ The equation is in the form $x=a$, where $a$ is a constant. The graph of the equation represents a vertical line with the $x$-intercept $(a,0)$. We take the $x$-intercept $(4,0)$ and another point $(4,3)$ for example. Plot the two points and connect them.