Chapter 5: Linear Systems Section 2: Using Algebra
Topics in Algebra 1 © 2001, 2002 Texas Instruments Teacher Notes 5-35
Reminders for the
Try-It!™ Exercises
TI-83 Plus and TI-73:
•
Only the variables X and Y are used for graphs and tables. If an equation uses letters other
than X and Y, you have to change the variables in the problem to X and Y in order to use
some features on the calculators.
•
Some value is always stored in each variable. You must store the value you want in order to
understand how the calculator interprets a variable expression. The calculator does not
perform symbolic manipulations.
•
The intersect feature on the TI-83 Plus and the Solver feature on both the TI-83 Plus and the
TI-73 are best used to find the solution to a system with one solution. Students should use
their knowledge about the equations of lines to determine if lines are parallel or the same
line before working the problem.
•
In the Solver,
bound = {
M
1
å
åå
å
99, 1
å
åå
å
99} represents the real number line for the calculator. You
can make the set smaller to find solutions in a particular interval. See the TI-83 Plus or TI-73
guidebook for more details.
TI-83 Plus:
• When the intersect feature is used, an error is displayed if the lines are parallel. If the lines
are the same line, the calculator will show only one answer.
• In the challenge problem, students are asked to investigate using the Solver feature on the
TI-83 Plus to find the solution. Find this feature in
0:Solver. See the TI-83 Plus
guidebook for details about the Solver feature. You have to enter the equation in the Solver
as 0 = L4x + 2 N (2x N 2.5). You have to input a guess for the X solution. Then, use ƒ
\ to find the calculator’s numerical solution.
Extra Practice: Using Your Calculator to Find Solutions
Note: These problems are identical for both the TI-83 Plus and the TI-73.
1a. (3, 0.125)
1b. (2/3, 4)
2a. Answers will vary. Students use their choice of calculator feature to solve for Cathy’s pay
rate.
2b. Answers will vary. Students use their choice of calculator feature to solve for Cathy and
Brenda’s shopping trip.
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