Texas Instruments TI-82 User Manual - Page 68
Function Graphing
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Editing a Function 1. Move the cursor to the function in the Y= list you want to change. 2. Make the changes. You can press ' to erase the expression and then enter a new expression. The expression is stored as one of the ten user-defined functions in the Y= list as you enter it. Clearing a Function To clear or erase a function on the Y= edit screen, position the cursor anywhere on the function, and then press '. Defining Functions from the Home Screen or a Program 1. Begin on a blank line. Press ƒ ã"ä, enter the expression, and then press ƒ ã"ä again. 2. Press ¿. 3. Press y ãY.VARSä, select Function..., and then select the name of the function, which is copied to the cursor location. 4. Press Í to complete the instruction. "expression"!Yn When the instruction is executed, the TI.82 stores the expression to the Y= list, selects the function, and displays the message Done. Evaluating Y= Functions in Expressions You can the calculate the value of a Y= function at a specified value of X. For example, if Y1=.2X3-2X+6: 3-6 Function Graphing
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