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Question

Find the value of x and y.
3x7=1yx+1y=1


A

2 , -1

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B

1, 2

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C

3, -2

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D

-2, 5

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E

3, -5

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Solution

The correct option is A

2 , -1


3x1y=7x+1y=1Substituting 1y with a and multiplying equation (iv) by 3, we get3xa=7......(iii)x+a=1........(iv)Solving the above two equations we geta=44=11y=1y=1 [1y=a]Substituting value of y in equation (ii) we getx+1y=1x=2x=2,y=1


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