To get the reflected ray equation, find the equation of the line passing through the point of intersection of incident ray,   x-axis and the image of any point on the incident ray with respect to the  x- axis 
The line $\mathrm{x}+\sqrt{3}\mathrm{y}=\sqrt{3}$ meets   x-axis at $A\left(\sqrt{3},0\right)$
A point on the line $\mathrm{x}+\sqrt{3}\mathrm{y}=\sqrt{3}$ is  $B\left(0,1\right)$
The image of  B with respect to  x-axis is  ${\mathrm{B}}^{\text{'}}\left(0,-1\right)$
The equation of the reflected ray is the line passing through the point  $\mathrm{A}\left(\sqrt{3},0\right)$ and ${\mathrm{B}}^{\text{'}}\left(0,-1\right)$
$\mathrm{y}+1=\frac{0+1}{\sqrt{3}-0}\left(\mathrm{x}-0\right)$
Therefore, the equation of the reflected ray is  $\boxed{\sqrt{3}y=x-\sqrt{3}}$