Q13 of 136 Page 28

The straight line is

We have,



Also, the given line is parallel to the vector,



Let be perpendicular to the given line.


Now,


3x + 4y + 0z = 0


It is satisfied by the coordinates of z-axis, i.e. (0, 0, 1).


Hence, the given line is perpendicular to z-axis.

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