Examples:

> with(DEtools):
dfieldplot([diff(x(t),t)=1,diff(y(t),t)=-x(t)/y(t)], \
[x(t),y(t)],t=-2..2,x=-2..2,y=-2..2,arrows=LARGE,title=`Circles`);

[Maple Plot]

> dfieldplot([diff(x(t),t)=1,diff(y(t),t)=3-2*y(t)], \
[x(t),y(t)],t=-2..2,x=-2..2,y=-0.5..3.5,arrows=LARGE,title=`Problem 1.1#1`);

>

[Maple Plot]

> dfieldplot([diff(x(t),t)=1,diff(y(t),t)=3+2*y(t)], \
[x(t),y(t)],t=-2..2,x=-2..2,y=-4.5..2,arrows=LARGE,title=`Problem 1.1#3`);

[Maple Plot]

> dfieldplot([diff(x(t),t)=1,diff(y(t),t)=-1-2*y(t)], \
[x(t),y(t)],t=-2..2,x=-2..2,y=-3..2,arrows=LARGE,title=`Problem 1.1#4`);

[Maple Plot]

>