The graph shown below represents a ladder leaning against a wall. The bottom of the ladder is 4 feet from the wall, and the top of the ladder reaches 20 feet above the ground. A graph titled Ladder Leaning Against Wall has Feet from Wall on the x-axis and Feet above Ground on the y-axis. A line goes through points (0, 20) and (4, 0).
What is the slope of the graph?
–24
–20
–5
–4