Chapter 4 Labels | Data Visualization with ggplot2 - Rsquared Academy 4.9.2 X axis label ggplot(mtcars) + geom_point(aes(disp, mpg)) + xlab('Diaplacement') + theme(axis.title.x = element_text(color = 'blue', family = 'Arial', face = 'bold', size = 8, hjust = 0.5, angle = 15)) 4.9.3 Y axis label