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Q.

Solution of 1x+1y=2 and 1x1y=3 is___________ .

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a

y=25 and x=35

b

y=15 and x=15

c

y=35 and x=25

d

y=-2 and x=25

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Given equations are, 1x+1y=2 and 1x1y=3 

Let us take, 1x=p and  1y=q 

Then, 

p + q = 2,   ...(1)

and, 

p - q = 3,    ...(2)

Adding (1) and (2) we get, 2p = 5 

 or, p=52 

x=1p=25

Subtracting (1) from (2) we get, -2q = 1 

Or, q=-12 

y=1q=-2

Hence, y=-2 and x=25 

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