**Introduction**

This program plots the slope field for the differential equation in the
form .

If you have not used one of the programs posted on this website before,
you should read through
the information in the Intro to Programming
section first.

**The Program **

:ClrDraw | {ClrDraw is in DRAW under Draw} |

:FnOff | {FnOff is in Y-VARS under ON/OFF} |

:7*(XMax-XMin)/83H | {XMax, XMin are in VARS under WINDOW} {The arrow is STO} |

:7*(YMax-YMin)/55K | {YMax, YMin are in VARS under WINDOW} |

:1/(0.4*H)^2A | |

:1/(0.4*K)^2B | |

:XMin+0.5*HX | {X is X,T button} |

:YMin+0.5*KZ | |

:1L | {The 1 is a one} |

:Lbl 1 | {Lbl is in PRGM under CTL} |

:1J | |

:ZY | |

:Lbl 2 | |

:Y1T | {Y1 is in Y-VARS under FUNCTION} |

:1/(A+B*T^2)C | { is the square root button.} |

:T*CS | |

:Line(X-C,Y-S,X+C,Y+S) | {Line is in DRAW under Draw} |

:Z+J*KY | |

:IS>(J,8) | {IS> if in PRGM under CTL} |

:Goto 2 | {Goto is in PRGM under CTL} |

:X+HX | |

:IS>(L,12) | |

:Goto 1 |

**Running the Program**

You will need to enter a function *f*(*x,y*) into
Y1 and adjust the WINDOW accordingly
before running the program. You can use the X,T
button for X and the ALPHA button for Y.