Return to Open Page for TI89 Titanium
To get to the Y= screen, What is available from this Y= screen? 
F2  ZOOM #6 Zoom Standard creates a 10 x 10 tick mark window. Remember that the aspect ratio of the standard window is not 1:1. TI89  25:12 aspect ratio 
F3  Edit selected function Also, you can simply arrow up onto the function and press ENTER to edit. 

F4 Select or deselect function (√ mark shows to left of selected functions. Selected functions are the ones that get graphed ) 
F5  All Functions Turn ALL functions off or on quickly. 
F6  Style of Graph Change the style of the graph  dotted line, thicker line animated bubble, etc. 

Use GREEN DIAMOND to execute the window option.  TI89 – WINDOW above
F2 
Example: 
1. FROM the
GRAPH screen: 
Hit F3  Trace. 

2. FROM the HOME
screen:

Engage VAR –
found above the subtraction key  to find the
Y1 variable. Arrow down on
that menu to find your function, Y1.

Now enter numeric value or variable.

