Drawing A Function Or Inverse On A Graph - Texas Instruments TI-89 Manual Book

Drawing a Function or Inverse on a Graph

Drawing a Function,
Parametric, or Polar
Equation
To display the Home screen
and put DrawFunc in the
entry line, press:
: 2 ˆ 2
TI-89
TI-92 Plus : ˆ 2
Tip: To clear the drawn
function, press †
— or —
TI-89: 2 ˆ and select
1:ClrDraw .
TI-92 Plus: ˆ and select
1:ClrDraw .
Drawing the Inverse
of a Function
To display the Home screen
and put DrawInv in the
entry line, press:
TI-89: 2 ˆ 3
TI-92 Plus: ˆ 3
212 Chapter 12: Additional Graphing Topics
For comparison purposes, you may want to draw a function
over your current graph. Typically, the drawn function is some
variation of the graph. You can also draw the inverse of a
function. (These operations are not available for 3D graphs.)
Execute DrawFunc , DrawParm
a program. You cannot draw a function or equation interactively
from the Graph screen.
DrawFunc expression
DrawParm expression1 , expression2 [,tmin] [,tmax] [,tstep]
DrawPol expression [, q min] [, q max] [, q step]
For example:
1. Define
y1(x)=.1xòì2x+6
Y= Editor, and graph the
function.
2. On the Graph screen, press:
: 2 ˆ
TI-89
: ˆ
TI-92 Plus
and select
2:DrawFunc
3. On the Home screen, specify
the function to draw.
4. Press ¸ to draw the
function on the Graph
screen.
You cannot trace, zoom, or
perform a math operation on
a drawn function.
Execute DrawInv from the Home screen or a program. You cannot
draw an inverse function interactively from the Graph screen.
DrawInv expression
For example, use the graph of
1. On the Graph screen, press:
2 ˆ
TI-89:
ˆ
TI-92 Plus:
and select 3:DrawInv
2. On the Home screen, specify
the inverse function.
3. Press ¸.
The inverse is plotted as
( y,x ) instead of ( x,y
, or DrawPol from the Home screen or
on the
.
DrawFunc y1(x)ì6
y1(x)=.1xòì2x+6
.
DrawInv y1(x)
).
as shown above.