- $ \\\frac{{x - 1}}{2} = \\\frac{{y - 3}}{{ - 3}} = \\\frac{{z + 1}}{{ - 1}}$.
- $ \\\frac{{x + 1}}{2} = \\\frac{{y - 6}}{{ - 3}} = \\\frac{{z + 2}}{1}$.
- $ \\\frac{{x + 1}}{2} = \\\frac{{y + 3}}{3} = \\\frac{{z - 1}}{1}$.
- $ \\\frac{{x - 3}}{2} = \\\frac{y}{{ - 3}} = \\\frac{{z + 1}}{1}$.