Linear Algebra
College students dread linear algebra, while one cheerful student assumes it's just y = mx + b; the others don't have the heart to correct him.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-02-16-linear-algebra/ (CC BY-NC 4.0)Transcript
A: "Bad news. We all have to take Linear Algebra next semester."
B: "No problem! I did that in 10th grade. Lines are the easy part of algebra."
C: "Do you want to break the news?" D: "Not really. Why tarnish the innocence?"
B: "y = mx + b. Done!"