Answer:
-127/40 
Explanation:
Sorry this is super late, but here we go! 
the equation for slope: (y2-y1)/(x2-x1) 
we can label the points
x1=-27
y1=71
x2=13
y2=-56
now, sub. into the equation
(-56-71)/(13--27) 
-127/40
yes... that's actually the number
Hope this helps though!