plotting line from a certain position

Hi folks,

this might be a trivial question, but I could not figure it out from the
documentation or the examples.

I have a plot where the x-scale ranges from 0 to 20.
When I plot a line it automatically starts at x=0. I would like the line to
start at x=1. Is there a way to how I can do that?

Any help appreciated

regards
Oliver