so to find the slip you need at least two points, in this case 2 points are given
The equation for slope is
Y2-y1/x2-y1= slope
The points we have are
(1,-5)
(-3,3)
Y=3-5=-2
X= -3-1=-4
-2/-4 the negatives cancel out leaving
2/4 and you can simplify this by dividing both parts by 2
1/2 is the final answer