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Source: — Data Sufficiency |

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by Ian Stewart » Sun Aug 24, 2008 6:51 pm
If (r, s) is on the line y = 3x + 2, then s = 3r + 2. That's what we want to know.

From 1), either:

3r + 2 - s = 0, that is, s = 3r + 2

OR

4r + 9 - s = 0, that is, s = 4r + 9

Since we have no way to know which case is true, 1) is insufficient.

From 2), we similarly get two cases.

Taken together, 3r + 2 - s must be zero, since s cannot be equal to both 4r + 9 and to 4r - 6. So C.

Good luck on your test, Hemant! I hope it goes well.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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