vault backup: 2023-12-18 10:07:15

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zleyyij 2023-12-18 10:07:15 -07:00
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For a function to have an inverse, it needs to have one $x$ for every $y$, and vice versa. You can use the horizontal line test to verify that the inverse of a function is valid. If you can draw a horizontal line and it crosses through two points at the same time at any height, the inverse is not a valid function.