Answer
The graph is shown below.
Work Step by Step
The given linear equation is
$\Rightarrow y=3x-12$
For the vertical intercept plug $x=0$.
$\Rightarrow y=3(0)-12$
Simplify.
$\Rightarrow y=-12$
The vertical intercept is $A=(0,-12)$
Slope is $m=3=\frac{3}{1}$, so the rise is $3$ when the run is $1$.
Starting at $(0,-12)$ and going up $3$ and over $1$, we get to $B=(1,-9)$.
Repeat the same to get the next point $C=(2,-6)$.
By using theses three points draw a line.