File:Parabola on line.png

Summary
I created this image from the following R code:

library(tidyverse)

df <- data.frame(x=seq(0,5,0.1)) df <- df %>% mutate(y=x*x)

ggplot(df, aes(x, y)) + geom_line + geom_smooth(method="lm", se=FALSE, linetype='dashed') + theme_bw + theme(axis.title.x=element_blank,       axis.text.x=element_blank,        axis.ticks.x=element_blank,        axis.title.y=element_blank,        axis.text.y=element_blank,        axis.ticks.y=element_blank,        panel.grid.major = element_blank,        panel.grid.minor = element_blank        )