The answer would be 1/4
To find the slope, you use this formula:
slope: y1-y2/x1-x2
You need to determine two point. In this case, let use the point where y=0 and y=1 which was
x1, y1= (-4,0) and x2, y2= (0,1)
The calculation would be:
slope: y1-y2/x1-x2
slope: (1-0)/ (0- -4)= 1/4