Algebra 1HardSystems of Equations ShareSystems of Equations · Hard problemHow many solutions does this system have?{7x−6y=−9−21x+18y=28\begin{cases} 7 x - 6 y = -9 \\ - 21 x + 18 y = 28 \end{cases}{7x−6y=−9−21x+18y=28Ano solutionBexactly one solutionCinfinitely many solutionsCheck Show answer Walk through it step by step Practice more like this Review this concept