- $ \\\left\\\{ \\\begin{gathered} x = 1 - t \\\hfill \\\\\\ y = 2 - t \\\hfill \\\\\\ z = 2 \\\hfill \\\\\\ \\\end{gathered} \\\right.$.
- $ \\\left\\\{ \\\begin{gathered} x = 1 - t \\\hfill \\\\\\ y = 2 - t \\\hfill \\\\\\ z = 3 - t \\\hfill \\\\\\ \\\end{gathered} \\\right.$.
- $ \\\left\\\{ \\\begin{gathered} x = 1 + t \\\hfill \\\\\\ y = 2 - t \\\hfill \\\\\\ z = 3 \\\hfill \\\\\\ \\\end{gathered} \\\right.$.
- $ \\\left\\\{ \\\begin{gathered} x = 1 - t \\\hfill \\\\\\ y = 2 + t \\\hfill \\\\\\ z = 3 \\\hfill \\\\\\ \\\end{gathered} \\\right.$.