Texas Instruments TI-89 Voyage 200, User Manual

Page: 446 / 1008

Differential Equation Graphing 446
Before using
deSolve( )
, clear any existing t and y variables. Otherwise, an error occurs.
1. In the Home screen
@
"
"
use
deSolve( )
to
find the general solution.
2. Use the solution to define a function.
a) Press
C
to highlight the solution in
the history area. Then press
¸
to
autopaste it into the entry line.
b) Insert the
Define
instruction at the
beginning of the line. Then press
¸
.
Note:
Press
2 A
to move to the
beginning of the entry line.
3. For an initial condition
y=10
with
t=0
, use
solve( )
to find the @1 constant.
Note:
If you got a different constant (@2,
etc.), solve for that constant.
@1 represents a
constant. You may
get a different
constant (@2, etc.).
For @, type
@ 8 9
H 2
R