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crackgmat007
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line l has eqn y=mx+b
in 1 m = 3b so
y = 3bx+b
in 2 0 = m(-1/3) + b
m = 3b
both a and b are insuff b/c there are 2 unknowns in each
moreover both give us the exact same information, so combining them is still insuff
therefore E
