2 3/5 is 2.6 as a mixed fraction
So you would use the equation y=mx+b
To find the slope of this line, we must use the equation:

Where
and
can be assigned to either point.
Let's use (-6, -13) as the point "1" and (3, -1) as the point "2":


So now we know that the slope between these two points is
.