You can use the command Table as following
obj = Line[{{-3, -1}, {3, -1}}];
Table[Graphics[obj], {i, 1, 3}]
I think you want to do something like this
Table[Graphics[Line[{{-3, -1}, {i, -1}}], Axes -> True], {i, 1, 3}]
I hope you've given any idea to solve your problem