The straight lines5x-9y-12=0andmx+10y=2 ...

The straight lines`5x-9y-12=0andmx+10y=2` are perpendicular to each other , state which of the following is the value of m:

A

18

B

`-9`

C

9

D

`-18`

Verified by Experts

The correct Answer is:

A

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