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How to draw more than one line in a coordinate?

When I use line in Sage. it will draw a line for me, with given points, and connect the point with straight line. but now I want to draw more than one line in a coordinate(to compare with each other). I try my best to do this ,but unfortunately, I failed.


this can draw a line in the coordinate ,but now i want more than one. how can i do it?