Example 5, the line $l$ passing through the point $(1, \sqrt{3})$, its downward direction forms the smallest angle of 60 with the negative axis, find the equation of $l$.

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$$
\text{Solution: } \begin{array}{l}
k_{y}=\tan 120^{\circ}=-\sqrt{3}. \text{ The equation is } \\
x-1=-\sqrt{3}(y-\sqrt{3}), \\
\text{which simplifies to } x+\sqrt{3} y-2=0 .
\end{array}
$$

Examples 1 to 5, involving "intercept on the $x$-axis" and "angle formed with the $y$-axis," are directly solved using the method in this article, making the solutions exceptionally concise.
(Author's affiliation: Zhang Ping - Department of Mathematics, Harbin Normal University, Wen Xiaoyu - Xinjiang Production and Construction Corps Education Institute)
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