Programs from Steven Gill (gillsr@aston.ac.uk)
For the casio fx-9700GE (but prob work on all other models)
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.:    'print' character
>=    Greater than or equal to 
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Solution Sketcher

For differential equations 
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"SOL SKETCH"
"Xmin"->A
"Xmax"->B
"Ymin"->C
"Ymax"->D
Range A,B,0,C,D,0
(Int B-Int A)/18->E  --
(Int D-Int C)/11->E  -- work out 'step' values (decrease for finer)
A->X
C->T
Lbl 0
T+F->T
Lbl 1
X+E->X
(.5E)->K
Plot (X-K),T+(-K*f1)