[R] equation of a line or curve

[CE.KA]

Hi R users
I used the function line(x,y) and line(lowess(x,y)) to see the correlation
between 2 variables (x,y).
Here is my question:
is there a way to ask R to tell me the equation of
-this line : line(x,y)
-this curve: line(lowess(x,y))
Best regards 
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