详细一点，啥曲线？

You can use plot() on the model you fit. Normally, the common used R model object all have generic method registered in plot(). If the plot() doesn't contain the class of your model, you need to give the fitted values and plot it by yourself. Or you could set methods for that model class, but this might not be worthwhile.

x <- rnorm(10)
y <- 2*x+rt(10,9)
out <- lm(y~x)
plot(y~x)
abline(out)