Note: To change the value of a, you must highlight with the mouse the number at the right of a = . To do this, you move the cursor to the number, press down the left mouse button and move across the number. After releasing the left mouse button you can then type the new value for a. It is important that you ONLY highlight the number before you begin typing. There is a difference between the image above and the LiveMath notebook: the term a =  appears in the animation above the graph while in the notebook it is below the graph.

Also, note that the animation also demonstrates the changing of the function. iThis is not a part of the original function.