Question

The equations of straight line passing through (a, b, c) and parallel to z-axis are _______________ .

Answer 1

Direction ratios of a line parallel to z-axis is (0, 0, 1)

Hence, equation of straight line passing through (a, b, c) and parallel to z-axis is

$$\begin{gathered} \frac{x-a}{0}=\frac{y-b}{0}=\frac{z-c}{1} \\ \mathrm{i}.\mathrm{e}.\frac{x-a}{0}=\frac{y-b}{0}=\frac{z-c}{1} \end{gathered}$$