Slopefields on the TI-86
Given a differential equation, say y' = 3x-y, here is how
to make the TI-86 draw a slopefield for that differential equation.
Put the calculator into Differential Equation mode: Press [2nd]
[MODE] and select DifEq as shown:
We must translate the differential equation: In place of the function (y
this case), write Q1, and in place of the variable (x in
this case), write t. So we get
Q1' = 3t-Q1, or as the calculator wants it, Q'1=3t-Q1.
Now press [GRAPH][Q'(t)=] and enter our differential equation
from the last step on the first line:
Press [EXIT][MORE][FORMT] and make sure that, at the bottom
of the screen, both SlpFld is selected:
Finally, press [WIND] to select a suitable window: (Set
and y ranges as usual; you can ignore t for now), and
Last Modified December 7, 1998.
Janeba's Home Page | Send comments or questions to: mjanebawillamette.edu
of Mathematics | Willamette
University Home Page