Texas Instruments TI-80 - Shading Areas on a Graph

Draw Operations 7-7
There are three shading instructions on the DRAW DRAW menu: SHADE_Y>,
SHADE_Y<, and SHADE(. These instructions are not interactive; they must be
entered on the Home screen or in the program editor.
SHADE_Y>
(
DRAW DRAW
,
item 6) takes up to four
arguments (functions of
X
).
SHADE_Y>
function
SHADE_Y>
function1
,
. . .
,
function4
When executed,
SHADE_Y>
plots the specified function(s) on
the graph and shades the area above the function with a
pattern.
The patterns for shading are automatically assigned in the
following order.
Function 1 Vertical pattern.
Function 2 Diagonal pattern, lower left to upper right.
Function 3 Diagonal pattern, upper left to lower right.
Function 4 Horizontal pattern.
When you specify multiple functions, the shading is done
sequentially.
Shading Areas on a Graph
Shading Areas
above a Function