plot(
  x = mtcars$hp,
  y = mtcars$mpg,
  xlab = "Horsepower (hp)",
  ylab = "Miles Per Gallon (mpg)",
  main = "Miles Per Gallon vs Horsepower",
  pch = 19, # Solid circles
  col = "blue")

Interpretation

There is a slight negative relationship between mpg and hp