Answer
Three additional points on the line can be:
$(5,0)$
$(6,-1)$
$(7,-2)$
Work Step by Step
If we interpret the slope, we can say that if $m=-1$, then for every $1$ unit increase in $x$, $y$ decreases by $1$ unit. Using that, we can calculate more points on the line.
The starting point is given $(4,1)$, after that, we have to add the aforementioned changes to the x and y-coordinates.
Next point can be:
$(4+1,1-1)=(5,0)$
Now, starting with $(5,0)$ we add the changes again:
$(5+1,0-1)=(6,-1)$
Now, starting with $(6,-1)$ we add the changes again:
$(6+1,-1-1)=(7,-2)$
