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If the lines y=4-3 x, a y=x+10 and 2 y+b...

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

A

18

B

-3

C

`(1)/(2)`

D

`-(1)/(3)`

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The correct Answer is:
A
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