[insaider]

http://www.r2d3.us/visual-intro-to-machine-learning-part-1/

This one will stay with me for life i think

Though perhaps more of a visualization than an illustration

[compscistd]

This would be perfect, but in English, the description on the left refers to graph points in Meters while the visuals' data points are in feet.

[mkl]

Not only that, but they're different measurements: 242.8 feet is 74.005 metres, not 73m.