2х-4у=6 х=6+4y/2 х=6+4y/2 х=6+4y/2 х=6+4y/2 x=6+4·(-1)/2 x=1
2х+3у=-1 2(6+4y/2)+3y=-1 6+4y+3y=-1 7y=-7 y=-1 y=-1 y=-1
2х-4у=6 х=6+4y/2 х=6+4y/2 х=6+4y/2 х=6+4y/2 x=6+4·(-1)/2 x=1
2х+3у=-1 2(6+4y/2)+3y=-1 6+4y+3y=-1 7y=-7 y=-1 y=-1 y=-1