gráfico-de-dispersão

How to transform dot scatter plot into density?

I would like to know how to turn a dot scatter plot into a dot density plot in the region, for example, where there are few points the color of the region will be light, where there are many points the color of the region will be darker. Grateful!

Overlay two scatter plots into just one (with ggplot)

I have 2 data frames one for males and one for females (the variables are the same, crc and maxilla). From each of these df I ... , please, have any idea how do I put these two graphs together into just one, with the slope lines of the regression visible?