Answer:
-2
Explanation:
From the graph, it appears that (0, 2) and (2, -2) are points on the line. (Othere points will work, as well; you just need two points.)
Slope = (difference between the y coordinates) / (difference between the x coordinates)
One phrase to remember this is slope = "rise over run" (vertical change divided by horizontal change from point to point).
Slope = (-2 - 2) / (2 - 0) = -4 / 2 = -2
The slope is -2.