x = x − 1
An equation with no solution, x = x − 1, read as someone's age: one year less than their age. Naturally, they also look younger than they look.
Transcript
[Board: x = x − 1] "So your age is… one year lower than your age?" "Yes. I also look much younger than I look."
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2024-09-03-x-x-1/ (CC BY-NC 4.0)