Question

система уравнения 2х+3у=-7 х-у=4

Answer 1

$left { {{2x+3y=-7} atop {x-y=4}} right. left { {{2x+3y=-7} atop {3x-3y=12}} right. 5x=5 x=1 1-y=4 -y=4-1 -y=3 y=-3$