how to overlay a line plot with a density plot? (R, ggplot2)

Question

Hi how do I overlap the following curves in one graph? Any help's appreciated. Thank you!

library(ggplot2)

x = -10:10
y = dnorm(x, mean=0, sd=3)
df.norm = data.frame('x'=x, 'y'=y)

ggplot(data=df.norm, aes(x=x, y=y)) +
        geom_line() +
        geom_point()

random = data.frame('x'=rnorm(1000, mean = 0, sd = 3))

ggplot(random, aes(x=x)) + 
        geom_density(size=1)

I tried the following and it didn't work

ggplot(data=df.norm, aes(x=x, y=y)) +
        geom_line() +
        geom_point() +
        geom_density(random, aes(x=x), size=1)

Answer 1

library(ggplot2)

x = -10:10
y = dnorm(x, mean=0, sd=3)
df.norm = data.frame('x'=x, 'y'=y)

random = data.frame('x'=rnorm(1000, mean = 0, sd = 3))

ggplot() +
  geom_line(data=df.norm, aes(x=x, y=y)) +
  geom_point(data=df.norm, aes(x=x, y=y)) +
  geom_density(data=random, aes(x=x), size=1)