How to draw multiple Lines from csv in R

Question

I just started using R and like to know how to plot a line . With one of my tool I am doing regression which generating csv files. FOrmat is as follows:

Answer 1

yourData <- read.csv("yourCSV.csv")
with(yourData, plot(X, Y, type = "l"))
with(yourData, lines(X, Y1))
with(yourData, lines(X, Y2))

Also see ?abline.