a) \[ \text{Rovina } \rho_1 \text{: } x = 2 + s, \quad y = s + t, \quad z = 3 + t, \quad s, t \in \mathbb{R}.\] \[ \text{Rovina } \rho_2 \text{: } x = 4 + u, \quad y = 2u - v, \quad z = 5 - v, \quad u, v \in \mathbb{R}. \]
b) \[ \text{Rovina } \rho_1 \text{: } x = s, \quad y = 2 + s + t, \quad z = 3 + t, \quad s, t \in \mathbb{R}. \] \[ \text{Rovina } \rho_2 \text{: } x = u + v, \quad y = 4 - u, \quad z = 6 + v, \quad u, v \in \mathbb{R}. \]
c) \[ \text{Rovina } \rho_1 \text{: } x = 3 + s, \quad y = -s, \quad z = 2 - t, \quad s, t \in \mathbb{R}. \] \[ \text{Rovina } \rho_2 \text{: } x = 3 + 2u - v, \quad y = u - 2v, \quad z = 2 + u + v, \quad u, v \in \mathbb{R}. \]
d) \[ \text{Rovina } \rho_1 \text{: } x = 1 + s, \quad y = 1 + t, \quad z = 1 + t, \quad s, t \in \mathbb{R}.\] \[ \text{Rovina } \rho_2 \text{: } x = 2 + u, \quad y = 2 - v, \quad z = 2 - v, \quad u, v \in \mathbb{R}. \]
