题目方程组{2x−y=7x+2y=−4\left\{\begin{array}{l}2x-y=7\\ x+2y=-4\end{array}\right.{2x−y=7x+2y=−4的解是()(\quad)()A.{x=1y=−5\left\{\begin{array}{l}x=1\\ y=-5\end{array}\right.{x=1y=−5B.{x=0y=−2\left\{\begin{array}{l}x=0\\ y=-2\end{array}\right.{x=0y=−2C.{x=2y=−3\left\{\begin{array}{l}x=2\\ y=-3\end{array}\right.{x=2y=−3D.{x=3y=−1\left\{\begin{array}{l}x=3\\ y=-1\end{array}\right.{x=3y=−1知识点：解二元一次方程组——加减消元法章节：方程与不等式 / 二元一次方程组
