Texas Instruments TI-86 User Manual - Page 218
The Solver Menu, Solving for the Unknown Variable, equation
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206 Chapter 15: Equation Solving You can display other menus in the interactive-solver editor The Solver Menu - t equation b GRAPH WIND ZOOM TRACE SOLVE graphs the solver zoom solves for the unknown variable or equation in eqn menu displays the interactive-solver editor window graphs eqn and editor activates the trace cursor To display the window editor, select WIND from the solver menu. When you select GRAPH or WIND from the solver menu, EDIT replaces the item you selected on the menu. To return to the interactive-solver editor from the graph or window editor, select EDIT. An ellipsis (...) indicates that the variable value continues beyond the screen. To scroll the value, press " and !. The squares disappear when you edit any value. After solving, you can edit a variable value or edit the equation, and then solve for the same variable or another variable in the equation. Solving for the Unknown Variable After you have stored all known variable values, set the bounds, and entered a guess (optional), move the cursor to the prompt for the unknown variable. To solve, select SOLVE from the solver menu (*). ♦ A small square marks the variable for which you solved. The solution value is displayed. ♦ A small square also marks the leftNrt= prompt. The value at this prompt is the value of the left side of the equation minus the value of the right side of the equation, evaluated at the new value of the variable for which you solved. If the solution is precise, leftNrt=0 is displayed. Some equations have more than one solution. To look for additional solutions, you can enter a new guess or set new bounds, and then solve for the same variable.
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