\( \left \{ \begin{array}{l}4x - y = 7 \ \5x + y = 2 \end{array} \right. \)
A.\(\left( {x;\,\,y} \right) = \left( { - 1; - 3} \right).\)
B.\(\left( {x;\,\,y} \right) = \left( {1;\,\,3} \right).\)
C.\(\left( {x;\,\,y} \right) = \left( {1; - 3} \right).\)
D.\(\left( {x;\,\,y} \right) = \left( { - 1;\,\,3} \right).\)
A.\(\left( {x;\,\,y} \right) = \left( { - 1; - 3} \right).\)
B.\(\left( {x;\,\,y} \right) = \left( {1;\,\,3} \right).\)
C.\(\left( {x;\,\,y} \right) = \left( {1; - 3} \right).\)
D.\(\left( {x;\,\,y} \right) = \left( { - 1;\,\,3} \right).\)
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Hóa Học lớp 12
