The slope of line \( u \) is given as \( -\frac{80}{73} \).
Since line \( v \) is parallel to line \( u \), it will have the same slope. Therefore, the slope of line \( v \) is also
\[ -\frac{80}{73}. \]
This is already in simplified form, so the final answer is:
\[ \text{slope of line } v = -\frac{80}{73}. \]