Cho hai đường thẳng \({d_1}:\left\{ \begin{array}{...

D

- Hướng dẫn giải

\(\begin{array}{l} {d_1}:\left\{ \begin{array}{l} x = 1 - t\\ y = 5 + 3t \end{array} \right.\\ \to {d_1}:3x + y - 8 = 0\\ \to \left\{ \begin{array}{l} {d_1}:3x + y - 8 = 0\\ {d_2}:{\rm{ }}x-2y + 1 = 0 \end{array} \right.\\ \Leftrightarrow \left\{ \begin{array}{l} x = \frac{{15}}{7}\\ y = \frac{{11}}{7} \end{array} \right. \end{array}\)

⇒ A, B, D sai.

\(Oy \cap {d_2}:{\rm{ }}x-2y + 1 = 0 \\\Leftrightarrow x = 0 \\\Rightarrow y = \frac{1}{2} \\\Leftrightarrow {d_2} \cap Oy = M\left( {0;\frac{1}{2}} \right).\)