To Graph an Equation



BEGINNING TI 83/84+ CALCULATOR USE

2nd ANS

Inserts answer from last calculation

2nd ENTER

The last calculation appears so it can be edited

You can continue to do this and go back several entries

To Graph an Equation

Y=

(Make sure your PLOTS are turned off – Put cursor on PLOT and hit ENTER)

Enter in equation

GRAPH

Y= Options

To turn off the equation

Put cursor on the equals and hit ENTER

To change type of line

Put cursor on the slash to left of Y= and hit ENTER

To Change a Window

WINDOW

Enter in new dimensions

TRACE

Option 1:

Enter equation into Y=

GRAPH

TRACE

Left/Right cursor keys move cursor up/down line

Up/Down cursor keys jump from one equation to another

Option 2:

Enter equation into Y=

GRAPH

TRACE

Type in x-coordinate (at bottom of screen)

ENTER

y-coordinate will appear

ZOOM Menu

1:ZBox

Allows you to draw a box around a section of your graph

-Place cursor at corner of section wanted

-ENTER

-Move cursor with arrow keys

-Hit ENTER when box is made

-Hit ENTER to zoom in

2:Zoom In

3:Zoom Out

Allows you to center in on a section of the graph

-Place cursor where you want to zoom

-ENTER

4:ZDecimal

When using TRACE, all values generated are to 0.1

6:ZStandard

Sets your window -10 to 10

7:ZTrig

Sets x-axis to degrees (count by 90) and y-axis counts by 1

8:ZInteger

When using TRACE, only integer values are generated

9:ZoomStat

Used to graph ordered pairs

0:ZoomFit

Helps generate a window to see the graph.

Once you can see the graph, use WINDOW to adjust it

2nd CALC Menu

When referring to Left and Right Bounds, imagine a vertical line at the point in question. Place cursor to the left of the line and hit ENTER. Then place cursor to the right of the line and hit ENTER. When asked to Guess?, hit ENTER

2:zero

Finds intersection of graph and x-axis

3:minimum

Finds coordinates of minimum on selected part of graph

4:maximum

Finds coordinates of maximum on selected part of graph

5:intersect

Finds coordinates of intersection of two graphs

To Graph Ordered Pairs

STAT

EDIT

1:EDIT

Clear data from lists

Put cursor on L1 and hit CLEAR ENTER

If you accidentally hit DEL the List will disappear

To put it back in

Put cursor on L2 – 2nd INS – 2nd (List Name) - ENTER

Enter in data

2nd STAT PLOT

Turn on Plot 1 – ENTER

Hit ENTER to select options, and cursor keys to move around in this menu

ZOOM

9 ZOOMSTAT

(Make sure you don’t have any equations in Y=}

STAT Menu

1:1-Var Stats

Generates statistical information about the data in the list

If the data is in L1, then just hit ENTER

If it is not, then you must type in the list name

2:2-Var Stats

Generates statistical information about the data in two different lists

If the data is in L1 and L2, then just hit ENTER

If it is not, then you must type in each list name, separated by a comma

Regression Choices

Generates an equation to fit the data.

To Get Equation for Linear Regression (Line of Best Fit)

Enter in ordered pairs (see above)

STAT

CALC

4:LinReg(ax + b)

If your x-coordinates are in List 1 and your y-coordinates are in List 2, then just hit ENTER

If your coordinates are in any other Lists, you must enter each one in separated by a comma

The lists are above the numbers – 2nd then the number

Comma - the key about the 7

To Generate Ordered Pairs from an Equation

Enter Equation into Y=

2nd TBLSET

TblStart= Choose what value to start with

Delta TBl = Choose what you what to count by

Indpnt: Refers to x value

Depend: Refers to y value

Auto – ordered pairs automatically generated

Ask – coordinates appear only when you hit ENTER

2nd TABLE

2nd Format Menu

Allows you to change the attributes of your graph

2nd LIST Menu

OPS

For each choice, enter in the List Name that you want to work with

1:SortA(

Sorts the list in ascending order

2:SortD(

Sorts the list in descending order

3:dim(

Returns the number of elements in the list

6:cumSum(

Generates a running total of the values in the list

7: List(

Calculates the difference in successive terms in the list

MATH

Allows you to perform calculations on the values in your lists

2nd CATALOG

Displays all of the functions on the calculator

DiagnosticOn

It generates the Correlation Coefficient and displays it when you find a regression equation (r). It only needs to be turned on once and will stay on unless turned off.

2nd Catalog

DiagnosticOn

ENTER

ENTER

STO

Allows you to store values in lists or variables

Example

2nd L1 *3 STO 2nd L2 (Multiplies values in L1 by 3 and stores them in L2)

3 STO ALPHA A (Assigns the letter A the value of 3)

To Darken or Lighten Screen

2nd Up Cursor to darken

2nd Down Cursor to lighten

To Work with Matrices

To enter in data

MATRIX

EDIT

Place cursor on Matrix you want to edit and hit ENTER

Type in dimensions – the ENTER key and the cursor keys move you around

To use a matrix

Get out of the MATRIX menu (2nd QUIT)

MATRIX

NAMES

Select the matrix you want and hit ENTER

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