We can do this by rearranging the equations into the form $y = mx + c$, where $m$ is the slope.
For the first line, $x - 2y = 7$, we can rearrange to get $y = \frac{1}{2}x - \frac{7}{2}$. So the slope of the first line, $m_1$, is $\frac{1}{2}$.
For the second
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