The straight line 3x+4y-5=0 and 4x=3y+15...

The straight line `3x+4y-5=0` and `4x=3y+15` intersect at the point P. On these lines the points Q and R are chosen so that `PQ=PR`. The slopes of the lines QR passing through `(1,2)` are a)`-7,1//7` b)`7,1//7` c)`7,-1//7` d)`3,-1//7`

A

`-7,1//7`

B

`7,1//7`

C

`7,-1//7`

D

`3,-1//7`

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The correct Answer is:

A

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