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Question

If the pair of linear equations x+y=1,x+ky=5 has a unique solution x=2,y=1, then value of k is

A
2
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B
3
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C
3
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D
4
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Solution

The correct option is A 3
Given equations are
x+y=1
x+ky=5
x=2,y=1
Putting x and y value in x+ky=5
2+k=5
k=52
k=3

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