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

The straight lines 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)/(3)`

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The correct Answer is:
A
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