Graph/chart Following are a series of cost behavior graphs. The total cost is shown on the vertical (y) axis and the volume (activity) is shown on the horizontal (x) axis. (Click the icon to view the graphs) For each of the following situations, identify the graph that most closely represents the cost behavior pattern of the cost in that situation. Some graphs may be used more than once or not at all. a. Monthly factory equipment depreciation, straight-line method is used