Algebra 1HardSystems of Equations ShareSystems of Equations · Hard problemHow many solutions does this system have?{7x+3y=−2−21x−9y=6\begin{cases} 7 x + 3 y = -2 \\ - 21 x - 9 y = 6 \end{cases}{7x+3y=−2−21x−9y=6Ainfinitely many solutionsBexactly one solutionCno solutionCheck Show answer Walk through it step by step Practice more like this Review this concept