Система уравнения 2х+3у=-7 х-у=4

[latex] \left \{ {{2x+3y=-7} \atop {x-y=4}} \right. \left \{ {{2x+3y=-7} \atop {3x-3y=12}} \right. 5x=5 x=1 1-y=4 -y=4-1 -y=3 y=-3[/latex]