Texas Instruments TI-85 User Manual

Now you are asked for a guess. Move the blinking cur-
sor to a point near the intersection and press the key
ENTER and you obtain the following.
Section 2.1 in Text
Using STAT and LinReg
Use the STAT the LinReg operations to find the equa-
tion of the best-fitting straight line through the three
points (0, 0), (1, 2), and (2, 1). (This is the Warm Up
Exercise in Section 2.1)
Solution. First press the keys 2nd STAT PLOT
and obtain the following.
Now press the key 1 and obtain the following.
Place the blinking cursor over On and press ENTER .
Make sure the other items are highlighted as shown in
the previous screen. Now set the dimensions of the
window to [−1, 3] by [−1, 3]. It is best to press the
Y = key and delete any functions. Now press the
keys STAT ENTER and obtain the following.
Input the data setting L1(1) = 0, L1(2) = 1, L1(3) = 2
in the first column and L2(1) = 0, L2(2) = 2, and
L2(3) = 1 in the second column. You obtain the fol-
lowing.
Now press the keys STAT  5 and you should see
the following.
40

Texas Instruments TI-85 Specifications

General

Brand	Texas Instruments
Model	TI-85
Category	Calculator
Language	English

Summary

Section 1.0 in Text: Graphing Basics

The Viewing Window Explained

Defines and illustrates the calculator's viewing screen boundaries (Xmin, Xmax, Ymin, Ymax).

Graphing in Standard Viewing Window

Instructions for graphing a function in the default viewing window settings.

Adjusting Viewing Window and Trace

Change Viewing Window Dimensions

Steps to adjust the viewing window parameters for graphing.

Using the TRACE Feature

How to use the TRACE feature to find points on a graph.

Section 1.1 in Text: Advanced Graphing

Piecewise Functions and Dot Mode

Graphing piecewise functions and using DOT mode for better display.

Section 1.2 in Text: Function Operations

The Root Operation for Zeros

Finding the x-intercept (zero) of a function using the calculator.

Finding Function Intersections

The Intersect Operation

Finding the point where two functions intersect.

Section 2.1 in Text: Statistics and Regression

STAT and LinReg for Data Analysis

Performing linear regression to find the best-fit line for data points.

Advanced Statistics and Table Generation

The TABLE Operation

Creating tables of function values by setting input parameters.

Function Evaluation and Program Execution

The Value Operation for Accuracy

Evaluating a function at specific x-values for high accuracy.

Executing Calculator Programs

Running user-defined or pre-loaded programs on the calculator.

Section 3.2 in Text: Tangents and Secants

Drawing Tangent Lines with DRAW

Using the DRAW menu to graph a tangent line to a function.

Section 5.2 in Text: Numerical Derivatives

nDeriv for First Derivatives

Calculating the numerical derivative of a function.

Chapter 12 Project: Predator and Prey Dynamics

The Program EULERS for System Dynamics

Troubleshooting Calculator Issues