[R] Howto convert Linear Regression data to text

[ashz]

Dear all,

How can I covert lm data to text in the form of "y=ax+b, r2" and how do I
calculate R-squared(r2)?

Thanks. 
 
Code:
x=18:29
y=c(7.1,7,7.7,8.2,8.8,9.7,9.9,7.1,7.2,8.8,8.7,8.5)
res=lm(y~x)

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