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Perhaps the problem came from indentation, that I have had to adjust a bit. Try this:

pol = polygon([(0,0), (0,10), (10,10), (0,0)], fill=True, rgbcolor=(0.81,0.81,0.81)) 
g = plot(x, (0,10), color="blue")
@interact
def _(c=slider(0.01,1, step_size=0.2, default=.5), inac=checkbox(True,"Domaine Inaccessible")):
    a = x.subs(solve(-c*x+6==x, x))
    h = plot(-c*x+6, (a,6), color="green")
    graph = h+g 
    if inac:
        graph += pol    
    show(graph, aspect_ratio=1, ymin=0,ymax=10)

By the way, the code failed if c=0, as I already pointed in other question, and the plot didn't keep proportions when checking or unchecking inac. I've modified the code to deal with these problems.

Perhaps the problem came from indentation, that I have had to adjust a bit. Try this:

pol = polygon([(0,0), (0,10), (10,10), (0,0)], fill=True, rgbcolor=(0.81,0.81,0.81)) 
g = plot(x, (0,10), color="blue")
@interact
def _(c=slider(0.01,1, step_size=0.2, default=.5),  inac=checkbox(True,"Domaine Inaccessible")):
    a = x.subs(solve(-c*x+6==x, x))
    h = plot(-c*x+6, (a,6), color="green")
    graph = h+g 
    if inac:
        graph += pol    
    show(graph, aspect_ratio=1, ymin=0,ymax=10)

By the way, the code failed if c=0, as I already pointed in other question, and the plot didn't keep proportions when checking or unchecking inac. I've modified the code to deal with these problems.

Perhaps the problem came from indentation, that I have had to adjust a bit. Try this:

pol = polygon([(0,0), (0,10), (10,10), (0,0)], fill=True, rgbcolor=(0.81,0.81,0.81)) 
g = plot(x, (0,10), color="blue")
@interact
def _(c=slider(0.01,1, step_size=0.2, default=.5), 
       inac=checkbox(True,"Domaine Inaccessible")):
    a = x.subs(solve(-c*x+6==x, x))
    h = plot(-c*x+6, (a,6), color="green")
    graph = h+g 
    if inac:
        graph += pol    
    show(graph, aspect_ratio=1, ymin=0,ymax=10)

By the way, the code failed if c=0, as I already pointed in other question, and the plot didn't keep proportions when checking or unchecking inac. I've modified the code to deal with these problems.