# TI-83 Introduction

## Preliminaries and Hints

1. The gray keys are the number keys. Example:     0           1
2. The blue keys on the right side of the keyboard are common math functions. Example:   +       —
3. The blue keys across the top will set up and display graphs. Example:   Y =     WINDOW
4. Most keys on the calculator will have alternate actions. The primary function is stenciled in white on the key face.
5. Secondary functions are accessed by pressing the     2ND     key.
6. The ALPHA key accesses the alpha (letter) characters.
7. Use A-LOCK (     2ND       ALPHA  ) to lock the Alpha function ON.

8. To change the contrast of the LCD screen (brightness/darkness), press the     2ND     button and hold down the   ⇑   or   ⇓  keys. Note the yellow graphic stenciled on the calculator between the up and down keys.
9. Pressing the CLEAR key will clear the LCD screen.
10. QUIT (   2ND   MODE ) will end most actions, menus and the Alpha key lock.
11. This tutorial will presume the default TI-83 settings.

Select MEM -> Reset -> Defaults -> Reset (   2ND     +     5     2     2    ).

12. To see the TI-83 MODE press   MODE   . The mode screen should look like this following a reset to defaults:

13. To change any of the MODE settings, use the arrow keys (   ⇓     ⇐     ⇒     ⇑    ) to highlight the setting you want, then press   ENTER   to select that setting. For example setting the TI-83 so it will display just 2 numbers past the decimal (   MODE     ⇓     ⇒     ⇒     ⇒   ENTER  ) results in a mode screen which looks like this:

14. If the TI-83 doesn't seem to turn on when the   ON   is pressed: Check that the contrast is turned up.
15. ERR: SYNTAX means there is a problem in the way an equation is written. When you get that message screen, you may press   1    to Quit the message screen. By pressing   2     the TI-83 will Goto what it thinks the problem is. This is very useful. You will almost always want to press   2   .

## TI Equation Operating System

Use your algebra skills to verify the algebraic order of operation of the TI-83 is correct by entering in these equations and evaluating.

1. Equation: 10 x 2 - 8 + 8 ÷ 4 =
3. Keystrokes:   1     0       X       2       —       8     +     8     ÷     4   ENTER
4. Record the TI-83 answer _______________________
5. Equation: (10 x 2) - (8 + 8) ÷ 4 =
6. Keystrokes:     (       1     0       X       2       )       —       (       8     +     8       )       ÷     4   ENTER
7. Record the TI-83 answer _______________________
8. Equation: 10 x ( 2 - 8 ) + 8 ÷ 4 =
9. Keystrokes:   1     0       X         (       2     —     8       )       +     8     ÷     4   ENTER
10. Record the TI-83 answer _______________________

## Alpha keys

1. Use the ALPHA key to display your name.
2. Write a nice message to your neighbor.

## Subtraction   —   and Negation (  ( – )  ) keys

The negation key is on the bottom row, next to  ENTER .

1. Equation: 4 - 5 + 3
2.   4     —     5     +     3
3. Record the TI-83 answer _______________________
4. Equation: 4 negative 5 + 3
5.   4   ( – )   5     +     3
6. Record the TI-83 answer _______________________
7. Equation: 4 (-5) +3
8.   4     (     —     5     )     +     3
9. Record the TI-83 answer _______________________
10. Equation: 4 (negative 5) +3
11.   4     (   ( – )   5     )     +     3
12. Record the TI-83 answer _______________________

## Variables

The TI-83 can store variables for use in expressions.

1. Store 5 in the X variable by pressing:     5       STO ⇒   X,T,θ,n   ENTER
2. Enter the expression "3X + 1" into the TI-83:     3       X,T,θ,n   +         1       ENTER
3. What does the TI-83 display ? _______________
4. Recall the last expression you entered by pressing     2ND     ENTER.
5. What does the TI-83 display ? _______________
6. When you press ENTER again what does the TI-83 display ? _______________
7. Change the X variable to 8:     8     STO ⇒ X,T,θ,n ENTER
8. Recall last entry by pressing     2ND     ENTER.
9. What does the TI-83 display ? _______________
10. Recall the previous entry by pressing     2ND     ENTER a second time.
11. What does the TI-83 display ? _______________
12. When you press ENTER (not 2nd Enter) again what does the TI-83 display ? _______________