1. **Problem:** Find the distance between the pair of parallel lines given by the equations: $$y = 7$$ and $$y = -1$$ 2. **Formula:** The distance $$d$$ between two parallel lines $$y = c_1$$ and $$y = c_2$$ is given by: $$d = |c_1 - c_2|$$ 3. **Apply the formula:** $$d = |7 - (-1)| = |7 + 1| = 8$$ 4. **Explanation:** Since these lines are horizontal, the distance is simply the absolute difference of their y-intercepts. **Final answer:** The distance between the lines $$y=7$$ and $$y=-1$$ is $$8$$ units.