Answer
Three additional points on the graph can be:
$(-1,-5)$
$(0,-7)$
$(1,-9)$
Work Step by Step
If we interpret the slope, we can say that if $m=-2$, then for every $1$ increase in $x$, $y$ decreases by $2$ units. Using that, we can calculate more points on the line.
The starting point is given $(-2,-3)$, after that, we have to add the aforementioned changes to the x and y-coordinates.
Next point can be:
$(-2+1,-3-2)=(-1,-5)$
Now, starting with $(-1,-5)$ we add the changes again:
$(-1+1,-5-2)=(0,-7)$
Now, starting with $(0,-7)$ we add the changes again:
$(0+1,-7-2)=(1,-9)$
