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Inequality Data sufficiency with two variables

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Source: — Data Sufficiency |
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by Gurpinder » Sat Aug 28, 2010 6:23 am
These are linear equations.

So (C) would be the best option in this case.

You have 2 variables and 2 equations. And the two equations are not the same. Therefore, you need both to substitute and solve for what the question requires.
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