Помогите решить!Очень надо!Ставлю 40 баллов! 1.{3х+2у=4 {х-у=6 2.{2х+у=6 {-4х+3у=8...

1)
$\left \{ {{3x+2y=4} \atop {x-y=6}} \right. \\\\ x = y+6\\ 3(y+6)+2y = 4\\ 5y = 4-18 = -14\\ y = -2.8\\ x = y+6 = 3.2$

2)
$\left \{ {{2x+y=6} \atop {-4x+3y=8}} \right. \\\\ y = 6-2x\\ -4x+3(6-2x) = 8\\ -10x = 8-18 = -10\\ x=1\\ y = 6-2x =4$

3) (исправляю опечатку)

$\left \{ {{y-x=2} \atop {y+x=10}} \right. \\\\ y = x+2\\ x+2+x = 10\\ 2x = 8\\ x=4\\ y = x+2 = 6$