Equation of a line passing through (x₁, y₁, z₁) and parallel to a line with direction ratios a,b,c is

Since the line passes through origin i.e. (0,0,0)

x₁ = 0, y₁ = 0, z₁ = 0

Since line is parallel to x - axis,

a = 1, b = 0, c = 0

Equation of Line is given by –