Plotting Direction Fields with Mathamatica7

[khary23]

Can someone please explain to me how one plots direction fields of differential equations in mathamatica 7? Two examples are
y'=3-2y
y'= -1-2y

Thank you

 

[jackmell]

Use StreamPlot[{x'[t],y'[t]},{x,-a,a},{y,-b,b}]

and in the case of just y'=f(x,y), use:

StreamPlot[{1,f[x,y]},{x,-a,a},{y,-b,b}]

 

[khary23]

Thank you!