Slope: (y2-y1)/(x2-x1)
x1=-11
x2=-3
y1=-16
y2=10
Let's subtract the "y"s first.
Remember, a double negative (2 negatives in a row... subtracting a negative) equals a positive.
10--16= 10+16=26
Now, let's subtract the "x"s.
-3--11
-3+11=8
Now we have to divide.
26/8=13/4
I believe the slope is 13/4 :).
Hope I helped!