Texas Instruments TI-84 PLUS SILV Guidebook - Page 76
Selecting and Deselecting Functions, Evaluating Y= Functions in Expressions
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3. Press ƒ a to display the YVAR shortcut menu, move the cursor to the function name, and then press Í. "expression"!Yn When the instruction is executed, the TI-84 Plus stores the expression to the designated variable Yn, selects the function, and displays the message Done. Evaluating Y= Functions in Expressions You can calculate the value of a Y= function Yn at a specified value of X. A list of values returns a list. Yn(value) Yn({value1,value2,value3, . . .,value n}) Selecting and Deselecting Functions Selecting and Deselecting a Function You can select and deselect (turn on and turn off) a function in the Y= editor. A function is selected when the = sign is highlighted. The TI-84 Plus graphs only the selected functions. You can select any or all functions Y1 through Y9, and Y0. To select or deselect a function in the Y= editor, follow these steps. 1. Press o to display the Y= editor. 2. Move the cursor to the function you want to select or deselect. 3. Press | to place the cursor on the function's = sign. 4. Press Í to change the selection status. When you enter or edit a function, it is selected automatically. When you clear a function, it is deselected. Chapter 3: Function Graphing 69