use y1 for y in the differential equation y1′, y2 for y in the differential equation y2′, etc.
Choose EULER for Solution Method and SLPFLD for Fields.
| Example: Graph the slope field for the differential equation: y ′ = x – y. | ||
| Steps | Key Sequence | Screens |
| 1. Change Graphing Mode to Differential Equations | Press MODE | |
| Press right arrow key | |
|
| Press 6 (for DIFF EQUATIONS) | |
|
| Press ENTER (to SAVE) | |
|
| 2. Enter Differential Equation | Press Diamond key, then F1 (Y=) | |
| NOTE: Use t for the independent variable and; use y1 for y in the differential equation y1′, y2 for y in the differential equation y2′, etc. |
||
| Type in differential equation | |
|
| 3. Change Solution Method | Press Diamond, then | key (for Graph Formats Menu) | |
| NOTE: Changing the solution method needs to be completed
only once – we will not consider other solution methods in this course. Choose EULER for Solution Method and SLPFLD for Fields. |
||
| 4. Graph the Slope Field | Press Diamond key, then F3 key | |
| NOTE: You can zoom in or out on the graph using the F2 menu. | ||
| NOTE: You can change the resolution by pressing Diamond Key, then F2 and changing the value for fldres=. | ||