Answer:
-3
Explanation:
To find slope you first need to pick to points where the line crosses a corner.
Slope=

I'm using the points (0,-2) and (-1,1). You can either count up and over for the slope or use the slope equation

y2=second y point
y1=first y point
x2=second x point
x1=first x point
Now you just solve
or -3