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For x=-6 and y=-9, find |x|,|y|,|x+y| an...

For `x=-6` and `y=-9`, find `|x|,|y|,|x+y|` and compare these values.

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`|x+y|=|-6+|-9|+|-15 mid=15`
`|x|+|y|=|-6|+|-9|=6+9=15^prime`
`|x,+y|=|x|+|y|`
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