Lesson: Simplifying Expressions

Comment on Simplifying Expressions

https://greprepclub.com/forum/gre-math-challenge-137-x-y-and-2-x-y-795.html
Can we divide both sides by x+y
greenlight-admin's picture

Question link: https://greprepclub.com/forum/gre-math-challenge-137-x-y-and-2-x-y-795.html

That would be nice!
However, when it comes to using the Matching Operation strategy, one of the big rules says:
Do NOT multiply or divide both quantities by a NEGATIVE value.
(more at https://www.greenlighttestprep.com/module/gre-quantitative-comparison/vi...)

Since x+y can be either positive or negative, we can't divide both sides by x+y.

Does that help?

Cheers,
Brent

Oh yh that's true. Thanks

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