Instructions: On the graph above, click the plotter tool (called “Marginal Cost”) and drag the first point you want to plot onto the grid. Continue clicking and dragging the plotter tool until you have identified all of the necessary points for this line. To remove a point from the graph, drag the point off an edge of the graph. Repeat these steps for the plotter tool (called “Average Total Cost”). (To plot a single point at precise coordinates, drag the point plotter onto the graph and then click the small icon representing a key. You can then enter precise values for either or both of the axes. Be sure to click set position.