Texas Instruments TINSPIRE Teacher Software Guidebook - Page 423

Creating a system of equations 1. On the Utilities tab, click Handheld: Press t. to display the templates. 2. Select . The Create a System of Equations dialog box displays. 3. Type the Number of Equations, and select OK. Calculator displays a template with spaces for the equations. 4. Type the equations into the template, and press · to define the system. Deferring evaluation You don't have to complete and evaluate an expression as soon as you begin typing it. You can type part of an expression, leave to check some work you did on another page, and then come back to complete the expression later. Working with variables When you first store a value in a variable, you give the variable a name. • If the variable does not already exist, Calculator creates it. • If the variable already exists, Calculator updates it. Variables within a problem are shared by TI-Nspire™ math and science learning technology applications. For example, you can create a variable in Calculator and then use or modify it in Graphs & Geometry or Lists & Spreadsheet within the same problem. For detailed information about variables, refer to the guidebook chapter "Using variables." Calculator 411