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The equation of a straight line parallel to the x-axis is given by |
$\frac{x-a}{1}=\frac{y-b}{1}=\frac{z-c}{1}$ $\frac{x-a}{0}=\frac{y-b}{1}=\frac{z-c}{1}$ $\frac{x-a}{0}=\frac{y-b}{0}=\frac{z-c}{1}$ $\frac{x-a}{1}=\frac{y-b}{0}=\frac{z-c}{0}$ |
$\frac{x-a}{1}=\frac{y-b}{0}=\frac{z-c}{0}$ |
Equation of straight line parallel to x−axis is $\frac{x-a}{1}=\frac{y-b}{0}=\frac{z-c}{0}$ because $l=\cos \alpha=1, m=\cos \beta=\cos \frac{\pi}{2}=0, n=\cos \gamma=0$ |
