Texas Instruments TI-83 Plus Manual Book page 128

Chapter 5: Linear Systems
Section 1: Using Graphs & Tables
³ Try-It!é on Your TI-83 Plus or TI-73
To Do This
4. Trace close to the intersection of
the graphs to find a value close to
the solution.
Since Zoom Decimal traces by
tenths, you can get close to the
answer but this is not the exact
answer. Notice that the point
(0.8, L1.2) on the screen is on Y1.
Is this point on Y2? Check it out!
For this particular calculator
setup, you don't get the exact
answer. Read on to see how to
refine the answer.
5. Use the table setup to refine the
solution.
Set up your table to show values
close to X = 0.8. As shown here,
you can use a starting value of 0
with increments of 0.25.
6. Search through the table to see
that the lines intersect at (0.75, L1).
Notice that both Y1 and Y2 are L1
when X = 0.75. Verify by hand that
the solution is (X, Y) = (0.75, L1).
You also know that there is only
one solution because the lines
intersect at one point, so your
search is complete.
Note: Learn more about the calculator features
Chapter 5: Linear Systems, Section 2: Using Algebra.
Topics in Algebra 1
Name
Date
(continued)
Press
r
}, †, ~, or |
y -
'
0
y 0
intersect
© 2001, 2002 Texas Instruments
Display
† '
0.25
in the ³ Try-It!™ section in
and Solver
Student Worksheet
(TI.83 Plus shown)
5-5