If the angle between the lines, x2=y2=z1 and  5−x-2=7y−14P=z−34 is cos−1⁡23, then P is equal to 

If the angle between the lines, x2=y2=z1 and  5x-2=7y14P=z34 is cos123, then P is equal to 

  1. A

    -4/7

  2. B

    7/2

  3. C

    -7/4

  4. D

    2/7

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    Solution:

    x2=y2=z1,x-52=y-2p7=z-34

    cosθ=22+2p7+144+4+14+p249+16=23p=72

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