How do I do problems likeUse absolute value notation to describe the situation.

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Use absolute value notation to describe the situation.

The distance between x and 9 is no more than 8.

I failed all the questions like this. How do I solve them.
Jan 14th, 2015

When we talk about the distance between 2 numbers, we usually just subtract those numbers to find the distance between them, so:

|x-9|<=8


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 equal to).

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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Jan 14th, 2015

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