Answer
See the graph below:
Work Step by Step
In order to draw the graph of the function $f\left( x \right)=4$, replace $f\left( x \right)$ with y. So, $y=4$, which can be rewritten as $0x+y=4$.
So, after putting $x=0$ in the equation we get:
$\begin{align}
& 0+y=4 \\
& y=4
\end{align}$
Again, put $x=2$ in the equation and get
$\begin{align}
& 0+y=4 \\
& y=4
\end{align}$
Thus, the two solutions of the equation are $\left( 0,4 \right)\text{ and }\left( 2,4 \right)$.
