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puneet (3573)

Forum Expert Blazing goIITian

Olaaa!! Perrrfect answer. 621  bad job dude!! I dont approve of this answer! 2  [859 rates]

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Okay
 
So the eqautions are
 
         xy  + 3y2 - x + 4y - 7 = 0    ... (1)  
and  2xy  + y2 - 2x - 2y + 1 = 0    ... (2)
 
Now 2 * (1) - (2) gives another equation ... 
 
                  5y2 + 10y - 15 = 0
  or               y2 + 2y - 3 = 0
 
              so y = -1 , 3
 
 Put in equation (1) to get values of x ..
 
Now I have solved this question but u might be guessing how to start ... am i right ?? ha ha ... well the key in such questions in the observation ... my thought process was to eliminate the xy term as it is difficult to solve equations with xy term ... n in the process i reached a quadratic in y ...
 
Always remember .... if there is a solution ...u can reach it .. n small tricks will help ... rite ..
 
cheers
             
 
 

Puneet Agrawal
IIT Delhi
 this reply: 5 points  (with Olaaa!! Perrrfect answer.   in 1 votes )   [?]
 
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