Ingredients Of Change: Functions And Linear Models; Models And Functions; Entering An Equation In The Graphing List; Stat Plot Error - Texas Instruments TI-84 Plus Manual

TI-83, TI-83 Plus, TI-84 Plus Guide
Chapter 1

1.1 Models and Functions

Graphing a function in an appropriate viewing window is one of the many uses for a function
that is entered in the calculator's graphing list. Because you must enter a function formula on
one line, it is important to use parentheses whenever they are needed.
NOTE: If you are not familiar with the basic operation of the calculator, you should work
through pages A-1 through A-3 of this Guide before proceeding with this material.
ENTERING AN EQUATION IN THE GRAPHING LIST The graphing list contains
1.1.1
space for 10 equations, and the output variables are called by the names
When you want to graph an equation, you should enter it in the graphing list. You must use
as the input variable if you intend to draw the graph of the equation or use the calculator's
table function. We illustrate graphing with the equation in Example 3 of Section 1.1: v(t) =
3.5(1.095 t ).
Press to access the graphing list.
Y=
If there are any previously entered equations that you will no
longer use, delete them from the graphing list.
For convenience, we use the first, or
We intend to graph this equation, so the input variable must be
called x, not t. Enter the right-hand side of the equation,
3.622(1.093 x ), with
that you should press

STAT PLOT ERROR:

when you are graphing an equation and not graphing data points. If any of these is darkened,
use until you are on the darkened plot name. Press
▲
(that is, to deselect the plot.
DRAWING A GRAPH As is the case with most applied problems in Calculus Concepts,
the problem description indicates the valid input interval. Consider Example 3 of Section 1.1:
The value of a piece of property between 1985 and 2005 is given by v(t) = 3.5(1.095
thousand dollars where t is the number of years since the end of 1985.
The input interval is 1985 (t = 0) to 2005 (t = 20). Before drawing the graph of v on this inter-
val, enter the v(t) equation in the
of the function v for x between 0 and 20.
Copyright © Houghton Mifflin Company. All rights reserved.
Ingredients of Change:
Functions and Linear Models
Y1
3 . 6 2 2 ( 1 . 0 9 3 ^ X,T,θ,n )
for x, not the times sign key,
X,T,θ,n
and
Plot1, Plot2,
list using X as the input variable. We now draw the graph
Y=
, location in the list.
. Note
at the top of the
Plot3 Y=
ENTER
and
Y1, Y2, ..., Y0.
To delete an equation
from the Y= list, position
the cursor on the line with
the equation. Press
CLEAR .
.
list should not be darkened
to make the name(s) not dark
t
)
X
5