Answer:
-4/4, or -1
To find a slope, always use rise/run. Here we start at the lower point, and count up the graph to the next point, and here it would be 4 times. Then you would "run" to the point. Here you would move left 4 times to get to the point. Since you moved left, this will make it a negative slope. If you come to a slope where you have to run right, it would be positive.
