# http://stat.ethz.ch/R-manual/R-devel/library/graphics/html/abline.html
# http://stat.ethz.ch/R-manual/R-devel/library/graphics/html/plot.html

# Set up coordinate system
plot(c(-2,3), c(-1,5), type="n", xlab="x", ylab="y", main="y = 2x + 1")
# Set up the x- and y-axis
abline(h=0, v=0, col="gray60")
# Set up a grid
abline(h = -1:5, v = -2:3, col = "lightgray", lty=3)
# Draw a line with slope=2 and y-intercept=1
abline(b=2, a=1, col="red")

# posted by rot13(Unafba Pune) @ 8:34 AM