Algebra 1HardSystems of Equations ShareSystems of Equations · Hard problemHow many solutions does this system have?{2x+7y=−2−6x−21y=5\begin{cases} 2 x + 7 y = -2 \\ - 6 x - 21 y = 5 \end{cases}{2x+7y=−2−6x−21y=5Ano solutionBexactly one solutionCinfinitely many solutionsCheck Show answer Walk through it step by step Practice more like this Review this concept