undefined

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undefined v/s not defined in JS

JavaScript - Array undefined error - Stack Overflow

Undefined Slope

Difference Between Null and Undefined - javatpoint

Undefined Technologies, Next-Generation Silent Drone

Undefined & Zero Slope Graph, Definition & Examples - Lesson

Undefined & Zero Slope Graph, Definition & Examples - Lesson

Null and Undefined in Javascript. What's the difference between null and…, by Megan Lo, Webtips

How do you graph the line through point (-2,-3) and slope is undefined?

Do your students get confused about whether an answer is zero or undefined? Here is a visual mnemonic to help students remember the difference.

Math Poster - Slope - Zero vs. Undefined