Tất cả các nghiệm của phương trình $0x + 5y = 2$ được biểu diễn bởi

A. $\left\{ \begin{array}{l}x - y = 2\\2x + y = 1\end{array} \right.$.

B. $\left\{ \begin{array}{l}2x = 0\\x + 5y = 15\end{array} \right.$.

C. $\left\{ \begin{array}{l}{x^2} - 4{y^2} = 0\\3x + 2y = 7\end{array} \right.$.

D. $\left\{ \begin{array}{l}2x - y = - 5\\3y + 15 = 0\end{array} \right.$.

A. $\left( {0;\,\,1} \right)$.

B. $\left( {1;\,\,0} \right)$.

C. $\left( {1;\,\,1} \right)$.

D. $\left( { - 1;\,\,0} \right)$.

A. $a = 1;\,\,b = 1;\,\,c = 0$.

B. $a = 1;\,\,b = 2;\,\,c = 1$.

C. $a = 1;\,\,b = 2;\,\,c = - 1$.

D. $a = 1;\,\,b = - 2;\,\,c = 1$.

A. $x + 2y = 1$.

B. $0x - 0y = 5$.

C. $0x - y = 3$.

D. $x + 0y = - 6$.

A. $\left\{ \begin{array}{l}x + y = 3,5\\x + 150y = 500\end{array} \right.$.

B. $\left\{ \begin{array}{l}x + y = 3,5\\250x + 150y = 500\end{array} \right.$.

C. $\left\{ \begin{array}{l}x + y = 3,5\\250x + y = 500\end{array} \right.$.

D. $\left\{ \begin{array}{l}x - y = 3,5\\250x + 150y = 500\end{array} \right.$.

A. $y = - 2x + 1$.

B. $y = 2x - 1$.

C. $y = \frac{2}{3}x - \frac{1}{3}.$

D. $y = \frac{2}{3}x + \frac{1}{3}$.

A. $\left( {0;\,\,1} \right)$.

B. $\left( {2;\,\,2} \right)$.

C. $\left( {3;\,\, - 3} \right)$.

D. $\left( { - 2;\,\,2} \right)$.