Graphing Inequalities - TI -82 Manual Book

Graphing Inequalities

Examine the inequality
explore the values of X where the inequality is true and where it is false.
Procedure
1. Press z. Select
y [
STAT PLOT
2. Press o. Turn off all functions. Enter the left side of the inequality as
and the right side as
Y
4
Y =.4X
4
Y =.2X+4
5
3. Enter the statement of the inequality as
if true and 0 if false.
Y =Y <Y
6 4
4. Press q
5. Press r † † to move to
value of
6. Press o. Turn off
inequality.
Y =Y Y
7 6
Y =Y Y
8 6
7. Press r. Notice that the values of
inequality is false.
14-6 Applications
. .
3
4X –3X+5<
Dot , Simul
] and turn off all stat plots.
Y
3
–3X+5
5
6 to graph the inequality in the standard
Y .
Y , Y , and
4 5
4
5
2X+4 graphically. Use the TEST functions to
, and the default
.
5
Y . This function evaluates to 1
6
Y and trace the inequality, observing the
6
Y . Enter equations to graph only the
6
and
Y
7
settings. Press
MODE
WINDOW .
are zero where the
Y
8