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Question

Find the values of x and y
10x+y+2xy=4,x+y0

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Solution

Take A=x+y,B=xy

10A+2B=4,15A5B=2

(5A)+(1B)=2&(3A)+(1B)=25

8A=85A=5,B=1

So,x+y=5,xy=1

x=3,y=2

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