Texas Instruments TI-83 Plus Manual Book page 143

Chapter 5: Linear Systems
Section 2: Using Algebra
³ Try-It!é on Your TI.83 Plus
You will:
•
Graph two lines of a system of equations.
Use ) to locate the intersection of the lines.
•
•
Use the intersect feature to find the solution to a system of equations.
•
Check the solution on the home screen using ¿.
Find the solution of the system:
Notice that these equations are already in the form of y = mx + b. They are in the form to enter
into your calculator.
To Do This
1. Exit the Topics in Algebra 1
application and clear the Home
screen.
2. First, enter M4X + 2 as Y1 and
2X N 2.5 as Y2 in the Y= editor.
Note: See TIp 3: Graphing a Function in the
Standard Window for more information.
3. Select the Zoom Decimal viewing
window.
Remember: You have to adjust the viewing window
depending on the system of equations. You can see
the intersection of the lines in the ZDecimal window
for this example.
4. The graph displays. Since this system
has one solution, you can find the
numerical solution using the intersect
feature.
Important Reminder: Be sure to use your
knowledge about the equations of lines to determine
if the lines are parallel or the same line. When you
use the intersect feature, an error displays if the lines
are parallel. If the lines are the same line, the
calculator shows ONLY one answer.
5. Use the
CALCULATE
called
intersect
numeric solution.
Topics in Algebra 1
Y1 = L4X + 2
Y2 = 2X N2.5
menu item
to find the calculated
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Date
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Student Worksheet 5-20