Should execute these at the beginning of Maple session:
> restart;
with(plots):with(DEtools):
Maple commands to set up Exercise 2 direction fields
> ODE2 := diff(y(x),x) = 2*x+y;
> DEplot(ODE2,y(x),x=-8..8,y=-8..8,arrows=slim,{[0,-2],[-1,3]},
title=`Direction field of y'=2x+y`);
Maple commands to set up Exercise 3 direction fields
> ODE3 := diff(v(t),t) = 1 -
v(t)/8;
> DEplot(ODE3,v(t),t=0..8,v=-2..16,arrows=slim,{[0,0],[0,3],[0,8],[0,10]},
title=`Direction field of v'=1-v/8`);
Maple commands to set up Exercise 4 direction fields
> ODE4 := diff(v(t),t) = 1 -
(v(t))^3/8;
> DEplot(ODE4,v(t),t=0..8,v=-2..6,arrows=slim,{[0,0],[0,1],[0,2],[0,3]},
title=`Direction field of v'=1-v^3/8`);