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Planes and line

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Source: — Data Sufficiency |
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by aatech » Fri May 16, 2008 6:16 am
Should be C

The graph will cut X axis as (-a,0) and (-b,0)

Stmt 1 = a+b = -1 => We cannot find the actual value of a and b- NOT SUFF

Stmt 2 gives us equation ab=-6 => We cannot find the actual value of a and b - NOT SUFF

Together we can find values of a and b so SUFF
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