Hey there!
We can use our slope given two points formula to calculate the slope.
y2-y1/x2-x1
Plug in values:
-1-8/-2-(-5)
Simplify:
-9/-2 + 5 =
-9/3 =
-3/1
That means negative three is our slope. Since slope is defined as ride over run, it goes up 3 and to the left one. That's because slope is also defined as up/right, and if it's negative you're going left.
Hope this helps!