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If the straight line y-2x+1=0 is the tan...

If the straight line `y-2x+1=0` is the tangent to the curve `xy+ax+by=0` at `x=1`, then the values of a and b are respectively
a) 1and 2 b) 1and -2 c) -1 and 2 d) -1 and -2

A

1 and 2

B

1 and `-2`

C

`-1` and 2

D

1 and `-2`

Text Solution

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The correct Answer is:
D
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