Math Plane 

6)  Linear Systems -- Algebra Features

Task: Solve the linear system

x + 4y = 18

3x - 2y = -2

"On"   (Home)

"A Calculate"     (Workspace appears)

"Catalog/Book" icon

Press "2"  (select the 'integral sigma' symbol)

Using the mouse pad, scroll to "Algebra"

"enter"

then, scroll to "solve system of linear equations"

"enter"

Number of equations: 2

Variables: x, y

"OK"   "enter"  (Workspace reappears)

In upper box, input  x + 4y = 18

In lower box, input 3x - 2y = -2

(note: negative key  (-)  is beside the enter key; equal  = is below ctrl key)

"enter"

The output:  {2, 4}

7) Editing and erasing your work -- ctrl c, ctrl v, and Delete

Tasks: enter the inequality 2x + 3y > 35. then, change the inequality from > to <. Finally, clear the workspace.

In the workspace, input

2    x   +   3    y  

"ctrl"   "catalog/book"

select the > symbol     "enter"

3   5    "enter"

The output:  2x + 3y > 35

To edit, press mousepad upward (to highlight this inequality)

"ctrl"  "c"

press mousepad downward (to move cursor to empty space)

"ctrl"   "v"

Now, move cursor to right of  > symbol.  "del"

Then, replace it with < symbol  (i.e. "ctrl" "catalog" , select < symbol)

"enter"

The Output:  2x + 3y < 35

To clear lines in the workspace:

Press mousepad in upward (or downward) direction to highlight lines in the workspace.

"del"   will clear the highlighted content

8) Spreadsheets and Statistics

Task: Find the mean, median, and standard deviation of the following set:

{3, 5, 11, -3, -6, 22, 3}

"Home"  (On)

Use mousepad to select the green spreadsheets/lists icon from the main screen

"enter"

Input data into the spreadsheet...

"menu"

4. Statistics  "enter"

1. Stat calculations   "enter"

1. one variable statistics

number of lists (1)   "OK"

the output:

median: 3

mean (x) = 5

standard deviation (population): 8.6

standard deviation (sample): 9.29

9) Trigonometry -- Trig Key

Tasks: Find cosine(41 degrees). Then, find the inverse tangent(1) in both radians and degrees.

"Home"  "A Calculate"  (Use mousepad/cursor or the letter A)

"Trig" Key (next to the 7)

Select 'cos' from the grid; "enter"

4    1

"ctrl"   "catalog/book"

select the degree symbol from the grid "enter"

"enter"

The output:   cos(41 x pi/180)

"ctrl"  "enter"

The output:   .75471

To find the inverse tangent:

"trig"     (select tan-1)    "enter"

input 1    "enter"

The output:  45

Now, to find the expression in radians:

"On"  (Home)

5. Settings   (Use the cursor or press 5)

2. Document Settings...

Use the mousepad to change the "Angle" dropdown menu from degrees to radians

Press mousepad down to "Make Default"    ("enter")

OK?   ("enter")

press A to return to the workspace

Re-enter tan-1(1)

or,  Use "ctrl c" -- "ctrl v" to copy tan-1(1)

"enter"

The output:    pi/4

10) Algebra -- Using Menu Key

Tasks: Factor the quadratic  x^2 + 5x + 4; Factor the cubic x^3 - 1

A Calculate  (Note: you can press "A" or use the cursor)

"menu"  (2 keys below the "On" button)

3: Algebra   (use the cursor; or, press 3)

2: Factor   (use cursor/mouse pad to move highlight bar and select; or, press 2)

The display:  factor(|)

(Input the quadratic)

x  (at the bottom of the alphabet keys) 

^ (on the left below the "ctrl" key)

2

press right side of mouse keypad (to move the cursor to the next term!)

+   5   x    +   4

"enter"

The output:   (x + 1) "dot" (x + 4)

then, to factor the cubic:

"menu"

3:Algebra

2:Factor

x     ^     3   

(press right side of keyboard to move cursor)

-    1

(**Note: must press the "minus" - key... do not press the "negative" (-) key!!)

"enter"

The output:  (x - 1) "dot" (x^2 + x + 1)

<< ti-nspire tutorial 1

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Catalog/Book Icon:

Catalog/Book Display:

Linear Systems in workspace:

Green Lists and Spreadsheets Icon:

Trigonometry Key:

cos(41 degree):

Inverse Tan(1)

(in degrees and radians):

Menu key next to the "mousepad":

Menu List:

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