How to add regression line to the given scatter plot in R?

@harry wrote:

I am currently trying to plot my regression model in the given scatter plot which I have a plot by using ggplot.I want to know how I can plot my model in the given plot.

#### Is the fertility rate of a country was a good predictor of the percentage of the population under 15?
ggplot(WHO, aes(x = FertilityRate, y = Under15)) + geom_point()

####  log transformation:
ggplot(WHO, aes(x = log(FertilityRate), y = Under15)) + geom_point()

#### Simple linear regression model to predict the percentage of the population under 15, using the log of the fertility rate:
mod = lm(Under15 ~ log(FertilityRate), data = WHO)
summary(mod)

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