how do i graph inequalities on the texas instrument 89?

Answer 1

Note 6G • Graphing Inequalities
Graphing an inequality is like graphing an equation except you select a graph style to shade above or below the boundary line. The calculator always graphs a solid line for the boundary regardless of the type of inequality.
a. Enter the boundary line equation into the Y= Editor screen and
press [Enter].
b. Highlight the boundary line equation, then press [2nd] [F6] (Style). (On a TI-92 Plus or a Voyage 200, press [F6].)
c. Select 7:Above to shade above the boundary line, or select 8:Below to shade below the boundary line.
d. Set an appropriate window and then display the graph.