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If the straight lines y=4-3x, ay=x+10, 2...

If the straight lines `y=4-3x, ay=x+10, 2y+bx+9=0` represent the three consecutive sides of a rectangle then ab =

A

18

B

`-3`

C

`1//2`

D

`-1//3`

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The correct Answer is:
A
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