TI-86 Reference

 

To Make Display Darker:         y }  (repeat as needed)

To Make Display Lighter:         y †  (repeat as needed)

(battery stength is indicated by the number in the upper right corner.  9 is the weakest)

 

To enter an exponent like 53                              5›3

To enter a negative number like -3                    Ì3                  (gray negative key)

To subtract two values like 5 – 3                       5 ¹ 3              (blue subtraction key)

To calculate an absolute value like |-3|   2nd ; F1[NUM]; F5 abs (-3)

To redisplay the previous calculation:                 y Í   [ENTRY]

To retrieve the answer to the previous problem: y Ì [[ANS]

 

To Graph:                                           s

 F1 o

                                        ‘ to erase any previous equations

                                    8 ¥ (Ì [x-VAR] ¹ 4)

                                    [EXIT]

                                                              F5 s

                                                  

 

To Change Graph Window:                   

 

Pre-set values:                  

F3 q F4 ZSTD [-10, 10] by [-10, 10]

F3 q [MORE] F4 ZDECM:

 [-6.3,6.3] by [-3.1, 3.1]

 

Any values you wish to enter:  F2 [WIND]

[Xmin, Xmax] by [Ymin, Ymax]

 

 

 

To Find Values on the Graph:          

F4 r

       (cursor is displayed with coordinates at the bottom)

     Use arrows to move cursor left or right on the graph

 

     Enter a number to move to a specific point

                                   

  

To Generate a Table of Values:                    Enter equation

                                                                        Set up table by using TABLE key

F2 [TBLSET]

                        DTbl  is the change in the x values

      View table by using F1 [TABLE]

 

 

To Find Special Points on a Graph:

                                                           

                                   

x-intercepts:      [GRAPH]; [MORE]

F1 [MATH]

F1 [ROOT]     

                        move left of intercept, Í

move right of intercept, Í

move back close to intercept, Í

 

 

minimum:          [GRAPH]; [MORE]

F1 [MATH];

F4 [FMIN]     

                        move left of minimum, Í

move right of minimum, Í

move back close to minimum, Í

 

maximum:         same as minimum, only use F5 [FMAX]

 

                       

intersection:      enter equations for Y1 and Y2

                        [GRAPH]; [MORE]

F1 [MATH]; [MORE]

F3 [ISECT]                 

                        move close to intersection point                         Í

Í

Í

           

 

 

Scatter Diagrams : TI-86

 

 

A.     Clear Previous Data                                               

  1. Press 2nd [+] …                             
  2. F2 [EDIT]
  3. Up arrow to highlight xStat
  4. CLEAR, ENTER
  5. Up arrow to highlight yStat
  6. CLEAR, ENTER

 

B.     Enter Data

 

Enter the x values in the 1st column, the y values in the second

 

C.     Draw a Scatter Diagram of the data:

  1. EXIT
  2. Press 2nd [+] …  
  3. F3 PLOT
  4. F1 PLOT1
  5. ENTER
  6. EXIT, EXIT                
  7. GRAPH
  8. F3 ZOOM      
  9. MORE
  10. F5 ZDATA
  11. EXIT

 

D.     When finished, turn STAT PLOT OFF

  1. Press y [+] [STAT]  
  2. F3 PLOT
  3. F5: PlOff

Press Í

 

E.      Calculate the Regression equation

  1. Press 2nd [+] …  
  2. F1 [CALC]; F3 [LinR]
  3. 2nd CUSTOM; MORE, MORE, F4 [STAT]
  4. arrow down to xStat and ENTER
  5. type a comma (,)
  6. repeat 2nd CUSTOM; MORE, MORE, F4 [STAT]
  7. arrow down to yStat and ENTER
  8. ENTER
  9. The model is y = a + bx    or   bx + a