Functions on Instagram
A sad decreasing graph envies a glamorous curve on Instagram; a friend notes that curve fails the vertical line test.
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/2018-10-30-functions-on-instagram/ (CC BY-NC 4.0)Transcript
[Phone: a glamorous S-shaped curve with lipstick and eyelashes, "3,106 Likes"]
Decreasing curve: "I'll never be as good-looking as the functions on Instagram."
Wavy curve: "Oh, honey, no function actually looks like that."