Texas Instruments TI-83 Plus Manual Book page 144

Chapter 5: Linear Systems
Section 2: Using Algebra
To Do This
6. You have to select a
order for the calculator to calculate
the numerical solution. Notice the
cursor is on the line Y1 = L4X + 2.
7. You have to select a
order for the calculator to calculate
the solution. Notice the cursor is on
the line Y2 = 2X N 2.5.
8. The calculator now needs a close
guess at the solution. Move the
cursor closer to the intersection.
9. The calculator uses a program to
calculate the numerical solution. The
numerical solution given is at
(0.75, L1). Check to see if this
solution is the exact solution or an
approximate value.
10. Check the solution on the home
screen. The value 0.75 is stored in the
X variable in the calculator. X is fixed
at 0.75 after you follow these steps.
Important Reminder: The calculator always has a
value stored in each variable. You must store the
value you want in order to understand how the
calculator interprets a variable expression.
11. Enter L4X + 2 to find the Y1 value at
X = 0.75. Notice that the output is L1.
12. Enter 2X N 2.5 to find the Y2 value at
X = 0.75. Notice that the output is L1
and Y1 = Y2 at X = 0.75.
The solution is (0.75, L1). Press
* to see if this agrees with
the graph of the lines!
Topics in Algebra 1
Press
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First Curve
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in
Second Curve
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Student Worksheet 5-21