c. \( \begin{array}{l}y=6 x+8 \\ y=6 x+13\end{array} \)

These two equations represent parallel lines because they have the same slope of 6. While they will never intersect, they are separated by the difference in the y-intercepts (8 and 13). This means for any value of \( x \), the value of \( y \) in the second equation will always be 5 units greater than in the first equation. When graphing these lines, remember to plot points carefully. Start with the y-intercepts on the y-axis, which are at (0, 8) for the first line and (0, 13) for the second. Draw the lines extending in both directions, ensuring they remain parallel. A common mistake is to confuse slopes, so double-check that the slopes remain constant as you draw!