Решить систему уравнения 8х+3у=-214х+5у=-7

$\left \{{{8x+3y=-21} \atop {4x+5y=-7 | * (-2)}} \right. \\ \left \{ {{8x+3y=-21} \atop {-8x-10y=14}} \right. \\ \left \{ {{-7y=-7 | : (-7):} \atop {8x+3y=-21}} \right. \\ \left \{ {{y=1} \atop {8x+3*1=-21}} \right. \\ \left \{ {{y=1} \atop {8x=-21-3}} \right. \\ \left \{ {{y=1} \atop {8x=-24 | :8}} \right. \\ \left \{ {{y=1} \atop {x=-3}} \right.$
Ответ: (-3;1)