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Source: Beat The GMAT — Data Sufficiency |
This is little tricky...
might confuse in eaxm condition.at leat i would have confused..
however..
From the question itself : ax+b=0 (given)
so x=-(b/a)
From 1 : a+b>0 here either both at the same time can be positive; any one of them can be negative at a time.
If both are positive simoulteneously then x could be negative ; if one of them is negative x would be positive ! hence not determinable.In sufficient.
From 2 : a>b ; if both are positive then x could be negative (from question we can compare); if both are negative then x would be positive; There can be other combinations also.in any case whether x is positive or negative can't be determined.In sufficient.
When we combine them we can't even determine whether x coule be <o> 0.So insufficient.
might confuse in eaxm condition.at leat i would have confused..
however..
From the question itself : ax+b=0 (given)
so x=-(b/a)
From 1 : a+b>0 here either both at the same time can be positive; any one of them can be negative at a time.
If both are positive simoulteneously then x could be negative ; if one of them is negative x would be positive ! hence not determinable.In sufficient.
From 2 : a>b ; if both are positive then x could be negative (from question we can compare); if both are negative then x would be positive; There can be other combinations also.in any case whether x is positive or negative can't be determined.In sufficient.
When we combine them we can't even determine whether x coule be <o> 0.So insufficient.
