Differential Equation Graphing 438
8. Return to the Y= Editor. Press:
,
9
— or —
@8Í
Set
Fields = DIRFLD.
Note: In this example, DIRFLD 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
yi1 and yi2.
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.
yi1={2,6,7} and yi2={5,12,18}
Note:
Use a list to specify more than one
initial condition.
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