Phương trình nào dưới đây có đường thẳng biểu diễn nghiệm song song với trục tung?

A. \(S = \left\{ {\left( {x;2x + 5} \right)|x \in \mathbb{R}} \right\}.\)

B. \(S = \left\{ {\left( {x;2x - 5} \right)|x \in \mathbb{R}} \right\}.\)

C. \(S = \left\{ {\left( {x;5 - 2x} \right)|x \in \mathbb{R}} \right\}.\)

D. \(S = \left\{ {\left( {x;\frac{{5 - x}}{2}} \right)|x \in \mathbb{R}} \right\}.\)

A. \(\left\{ \begin{array}{l}x = \frac{2}{3}\\y \in \mathbb{R}.\end{array} \right.\)

B. \(\left\{ \begin{array}{l}x \in \mathbb{R}\\y = \frac{2}{3}.\end{array} \right.\)

C. \(\left\{ \begin{array}{l}x \in \mathbb{R}\\y = - \frac{2}{3}.\end{array} \right.\)

D. \(\left\{ \begin{array}{l}x = - \frac{2}{3}\\y \in \mathbb{R}.\end{array} \right.\)

A. 

B. 

C. 

D. 

A. y = 2x.

B. y = −2x.

C. y = 2x + 1.

D. y = −2x + 1.

A. y – 2x = 5.

B. 2x – y = 5.

C. 2x + y = 5.

D. 2x – y = −5.