To graph absolute value, you can type "abs" or use pipe brackets (near the top right corner of most keyboards).
You can also use the absolute value symbol in the Desmos keyboard.
To see this example in action, click this link: https://www.desmos.com/calculator/tlr6grjznj
Here is another example you may also find helpful: https://www.desmos.com/calculator/zst6w8sns4
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