Texas Instruments TI-89 Manuale Utente

Differential Equation Graphing

 438

8. Return to the Y= Editor. Press:

,

— or —

@

8 Í

Set 

.

 In this example, 

 is used for 

two related differential equations that do 
not represent a 2nd-order equation.

9. Press:

@

2 ‰ 

Confirm that the axes are set as shown.

10. In the Y= Editor, clear the initial conditions 

for 

 and 

.

11. Return to the Graph screen, which 

displays only the direction field.

12. To graph a family of solutions, return to 

the Y= Editor and enter the initial 
conditions shown below.

 and 

 Use a list to specify more than one 

initial condition.