This video shows the user how to use a T189 calculator to plot linear equations. The video demonstration is done using an 'on screen' representation of the calculator – there are also verbal instructions. The equations are plotted on the same axis by selecting the 'y=' function. The corresponding values of y in terms of x are then inputted into the graphical calculator. Once this has been done for every equation you can get the calculator to display the graph. This then allows you to compare the different equations. In the example shown the graphical calculator illustrates that the lines are all parallel.
For more information and a demonstration please see the video.
How To: Use a TI89 calculator to graph linear equations
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