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The lines x-y-6=0, 4x-3y-20=0 and 6x+5y+...

The lines x-y-6=0, 4x-3y-20=0 and 6x+5y+8=0 are:

A

perpendicular

B

concurrent

C

parallel

D

none of these

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JBD PUBLICATION-STRAIGHT LINES-EXAMPLE
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