The first equation is $6x - 12y = -24$. We can divide both sides by 12 to get $x - 2y = -2$. Rearranging this equation to the form $y = mx + c$, we get $y = \frac{1}{2}x + 1$. So, the slope $m_1$ of the first line is $\frac{1}{2}$ and the y-intercept $c_1$ is 1.
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