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Is |a|=|b|?

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by Max@Math Revolution » Sat Aug 20, 2016 11:02 pm
Is |a|=|b|?
1) a+b=0
2) a-b=2

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Source: — Data Sufficiency |
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by Max@Math Revolution » Mon Aug 22, 2016 6:50 pm
If we modify the original condition and the question, we get a=±b?. Since the condition 1) is a=-b, the answer is yes and the correct answer is A.

- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
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