Use absolute value notation to describe the situation.
When we talk about the distance between 2 numbers, we usually just
subtract those numbers to find the distance between them, so:
In words, the absolute value of x minus 9 is less than or equal to 8 (it
can be 8, but it can't larger than 8, that is why we use less than or
We don't know if x or 9 is the bigger number, and when talking about
distances, they can most often never be negative, that is where the
absolute value comes in to play.
I hope this helps! :)
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