Question

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


2.{2х+у=6
{-4х+3у=8


3.{у-2=2
{у+х=10

Answer 1

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)

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