Note:To change the value of a or the coefficients of the equation, you must highlight with the mouse the number which you want to change. 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 the coefficient. It is important that you ONLY highlight the number before you begin typing.
Note that there is a slight difference in the animation and the LiveMath notebook. In the animation, the equation a = 1 appears above the graphs while in the notebook, it appears below the graphs.