Texas Instruments TI-83 Plus Manual Book page 112

Chapter 4: Linear Inequalities
Activities (continued)
Topics in Algebra 1
Worksheet Activity 2
Tell students to:
Use the table of the expression
(shown at left) to find out when
answer, and then using number sense to determine the exact
answer. Remind them to write their strategy for the solution and
to draw the solution set on a number line.
From the table, students should see that they need to test more
values between X=1 and
If you wish the students to continue the activity on their
calculators, tell them to enter the function in the Y= editor. Then
screen (- f), they can refine their
on the
TABLE SETUP
search as shown in the screens below.
The students see that
2.5XN1
to figure out when
2.5XN1< 3
screen and change the settings to
SETUP
and then investigate further. This problem should be discussed
to show that the search should still continue because the
endpoint of 1.6 is not in the solution set. The answer is
To investigate further, refine the table values by changing
, and Tbl=.01 .
TblStart=1.5
© 2001 Texas Instruments
Section 1: Using Graphs & Tables
shown on their worksheets
2.5X 1
by first estimating the
2.5X 1<3
X=2 to find where 2.5XN1<3
is equal to at
3 X=1.6
. Students can go to the
TblStart=1
Teacher Notes
.
, but they need
TABLE
and ,
Tbl=.1
X<1.6 .
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