The equation of a line passing through \( (a, b, c) \) and
\( \math...
The equation of a line passing through \( (a, b, c) \) and
\( \mathrm{P} \) parallel to \( z \)-axis is:
W
(1) \( \frac{x-a}{1}=\frac{y-b}{1}=\frac{z-c}{0} \)
(2) \( \frac{x-a}{0}=\frac{y-b}{1}=\frac{z-c}{1} \)
(3) \( \frac{x-a}{1}=\frac{y-b}{1}=\frac{z-c}{1} \)
(4) \( \frac{x-a}{0}=\frac{y-b}{0}=\frac{z-c}{1} \)
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