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Q.

If the curve y=y(x)represented by the solution of the differential equation (2xy2y)dx+xdy=0, passes through the intersection of the lines 2x – 3y =1 and 3x + 2y =8 then |y(1)| is equal to………..

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a

b

c

d

answer is A.

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Detailed Solution

(2xy2y)dx+xdy=02xy2dx=  ydxxdy2xdx=ydxxdyy2

Integrate both sides, we getx2=xy+C

The above curve is passing through the point of intersection of two lines 2x – 3y =1 and 3x + 2y =8, it is 2,1

Hence,4=2+CC=2

The curve is x2=xy+2 , to get the required value plug in x=1

Therefore, 

1=1y+21y=1y=1y=1

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