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March 29, 2015

March 29, 2015

Posted by **ggift** on Monday, October 19, 2009 at 6:45pm.

How can I write an equation to fit this? $10,000=$6,000-n?

- MATH 116 -
**jim**, Monday, October 19, 2009 at 6:57pmLet's first consider why $10,000=$6,000-n is wrong. It only has an equal sign, and if we subtract 6000 from both sides, we get n=4000, which is definitely not right; n could be 6001, or 10000, or 6789.

We need two inequality signs to express this.

What do we know?

n is greater than or equal to 6000

AND

n is less than or equal to 10000

We could write:

6000 <= n <= 1000

which is exactly that, or we could phrase it as "n is somewhere between or including 6000 through 10000" which I can write as

n is a member of [6000, 10000]

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