To graph more than one function, first press the key. The resulting screen should look like the one below:

Screen Picture of TI-83 Calculator

Enter each function next to one of the lines just as you would in plotting a single function. If any of Plot1, Plot2, or Plot3 are highlighted, that Plot must be turned off before graphing.  To turn a Plot on or off, click here to go to Scatterplot.  

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