Cho hai đường thẳng \({d_1}...

C

- Hướng dẫn giải

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

⇒ A, B, D sai.

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