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