# TI-83 Instructions

```Name: _______________________________________
Period: __________
TI-83 Instructions for Graphing
Clear Memory:
 2nd +
7(reset)
1(All RAM)
2(Reset)
Find the Intersection of Lines:




Y=
GRAPH
Y=
[second equation] i.e. Y=3X+7
GRAPH
You should see in the picture of the lines that they either intersect in the given window, or
will intersect (if you continued along far enough)
To Zoom Out:
 ZOOM
3
ENTER
 Repeat until you can see the part you want to be visible
Estimate Intersection:
 TRACE until you get to the point where they intersect
To POSSIBLY get the coordinates of intersection:
 2nd
GRAPH and find where the coordinates are the same for Y1 and Y2
To Calculate Intersection:
 2nd
TRACE
5(Intersect)
ENTER
ENTER
ENTER
1.) Graph several lines that are parallel to the line defined by: y=3x + 2
a.) Write the equations you used: ___________________, _____________, ___________
b.) Sketch the picture in the window:
2.) Explore lines intersecting with y=5x. Try y=4x, y=3x, y=2x, …, y=0.5x, y=0.4x, …
What do you notice?
3.) What is the equation of the line that appears to be closest to perpendicular with the line
y=5x?
Name: _______________________________________
Period: __________
Logic and Truth Tables on the TI-83
It is convention to use:
1 = TRUE
0 = FALSE
when dealing with truth values on computers and calculators
Entering a Truth Table:
 STAT
1(edit)
 1 ENTER
1 ENTER
0 ENTER
0 ENTER (to get first column A)
 1 ENTER
0 ENTER
1 ENTER
0 ENTER (to get second column B)
nd
 2
MODE
(gets back to home screen)
To generate the conditional: A  B, we will use: ~A or B:
 2nd MATH RIGHT ARROW (to choose LOGIC)
4 (to choose not)
 2nd
1 (to choose L1)
) (to close parentheses)
 2nd MATH
RIGHT ARROW (to choose LOGIC)
2(to choose or)
nd
 2
2 (to choose L2)
ENTER
 STO
2nd
3
(to store this value in L3
Understanding that to get A  B you must use ~A or B, write what you would have to use for the
following statements:
Type of Statement
Logic Symbols
Equivalent statement to
enter in calculator
Converse
Inverse
Contrapositive
Biconditional
1.) Are the truth tables what you expected to get? What do you notice?
2.) Play around and write down another neat observation that you will be willing to share.
```