Suppose m1 and m2 are 2 regression models created using lm() in R, then try

cm <- rbind(coef(m1),coef(m2)) # Coefficient matrix c(-solve(cbind(cm[,2],-1)) %*% cm[,1])

which would give you the point of intersection.

What about the error in this intersection point?

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What about the error in this intersection point?

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