Explain Example 15 "solve" for TI-89

The TI-89 will solve linear inequality problems such as 3(x + 2) - 5 4x The following screen images trace through the steps needed to generate such a solution.

Figure 1	Figure 1 starts out in a blank HOME screen. Note that the cursor is in the data entry line toward the bottom of the screen.
Figure 2	Pressing the key opens the Algebra menu shown in Figure 2. It just so happends that the "solve(" selection from the menu is the first selection in the menu and it is the highlighted selection in Figure 2. We press the key to make that selection.
Figure 3	The TI-89 has pasted the solve( into the data entry line. We are ready to enter the problem statement.
Figure 4	To enter 3(x + 2) - 5 we press . To generate the we can press . Then we complete the inequality with . Then we need to finish the solve() construction with a comma, the variable for which we want the inequality solved, and a closing parenthesis. The keys to do this are and .
Figure 5	Having formulated the command in Figure 4, we move to Figure 5 by pressing the key. The calculator displays the entry line and then the solution.