rxs0005 wrote:

If xy > 0, does xy – y = 3?

(1) xy = 3

(2) y – 1 = 0

From the given statement xy>0, we can deduce that either x,y>0 or x,y< 0

St1 we have xy=3

possible values of x and y are

x=-1, y=-3, substituting in the given we get 3-(-3)=6 which is not equal to 3

x=3,y=1, we get 3-1= 2 not equal 3

x=9,y=1/3 3- 1/3= 8/3 not equal to 3

we can safely that say that for any values satisfying given st1 we do not have the expression value equal 3

Hence Option B,C,E ruled out

St 2, y-1=0-----> y=1

we know only the value of y and that x>0 which is not sufficient. In order to satisfy the given equation that is xy-y=3 value of x should be 4 which we are not sure of.

Hence Ans should be A

thanks

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