' - - File: VII_Slope9.txt

' UNHAPPY SITUATION--when divide by zero becomes apparent.
F{x,y} =  (x + y) / (x - y)                   ' The slope function.

' Set  h = 0.1  increment in Options: Computation menu. "Best" Setting.
a = -3  :  b = 3  :  n = 15
c = -3  :  d = 3 :   m = 15

x1 = -0.5  :  y1 =  -0.5                    ' Initial condition for a particular solution.
x2 = -1  :  y2 = 0.5

PlotSlopeField[F, {a,b,n}{c,d,m}{x1,y1}{x2,y2}]

' Use the Shift-Z to zoom inward.  Note the arrows for the assumed directed flow.



