Constructing linear functions example 1 | Algebra I | Khan Academy

Linear model for ice sheet thickness

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[NebulusVoid]

Delta means difference between two numbers

∆Z=|X-Y|=|Y-X|

|Z| is the absolute number, meaning it takes away the minus sign making it a positive number. It doesn't matter which way the X, and Y are, being an absolute number it will equal the difference.

He got it wrong because the difference between two numbers can't be a negative. It's just 1.25-2

[cookiecat]

welp, I guess the haters don't like to learn something new XD