If 6xy = x^2y + 9y, what is the value of xy?
(1) x = -2
(2) x < 0
(1) x = -2
(2) x < 0
The GMAT is indeed adaptable. Whenever I answer RC, it proficiently 'adapts' itself to mark my 'right' answer 'wrong'.
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quadratic equation
Source: Beat The GMAT — Data Sufficiency |
lets solve the equation firstvscid wrote:If 6xy = x^2y + 9y, what is the value of xy?
(1) x = -2
(2) x < 0
6xy-y.x^2-9y = 0
y(6x-x^2-9) = 0
y = 0 or (x-3)^2 = 0
y = 0 or x = +3
st1) x = -2 ie x not equal to +3 so y definitely equal to 0, hence product xy = 0
st2) x < 0, it means x cannot be 3, so y definitely equals to 0, hence product
xy = 0
Hence it can be answered from both st1 and st2 independently
