change of the referentiel

I've made the representation of the point with the fonction plot and plot the segment between this point.
But the points were obtained with shp file this means with a lambert coordonate (X Y)
I need to shift the segment of the epsilon value (X+epsilon,Y+epsilon).
When I try to plot the new segment the representation it's not correct because the segment must be near to the point and it's not the case.
I would to know if you know a method to do it.
Is there à specific function in R to do it?
Is there à specific ways to parameter the fonction plot?

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