What is the equation to the straight line passing through (a, b, c) and parallel to z-axis?
1
\(\rm \dfrac{x-a}{1}=\dfrac{y-b}{0}=\dfrac{z-c}{0}\)
2
\(\rm \dfrac{x-a}{0}=\dfrac{y-b}{0}=\dfrac{z-c}{1}\)
3
\(\rm \dfrac{x-a}{0}=\dfrac{y-b}{1}=\dfrac{z-c}{0}\)
4
\(\rm \dfrac{x-a}{0}=\dfrac{y-b}{1}=\dfrac{z-c}{1}\)