Answer
Please see the graph.
Work Step by Step
Let $x=0$:
$y=6x+3$
$y=6*0+3$
$y=3$
Let $y=0$:
$y=6x+3$
$0=6x+3$
$6x=-3$
$6x/6=-3/6$
$x=-.5$
Let $x = 2$:
$y=6x+3$
$y=6*2+3$
$y=12+3$
$y=15$
$(0,3), (2,0)$ and $(2,15)$ are on the line.