1) 2x = 11 - y => y = 11 - 2x2) 2x + y = -23) -x + 2y = 3 => x = 2y - 34) 7x - 3y = 8 => 7(2y - 3) - 3y = 8 => 14y - 21 - 3y = 8 => 11y = 29 => y = 29/115) 2x - 3(29/11) = 8 => 2x - 87/11 = 8 => 2x = 87/11 + 88/11 = 175/11 => x = 175/22
Ответ: x = 175/22, y = 29/11.
1) 2x = 11 - y => y = 11 - 2x
2) 2x + y = -2
3) -x + 2y = 3 => x = 2y - 3
4) 7x - 3y = 8 => 7(2y - 3) - 3y = 8 => 14y - 21 - 3y = 8 => 11y = 29 => y = 29/11
5) 2x - 3(29/11) = 8 => 2x - 87/11 = 8 => 2x = 87/11 + 88/11 = 175/11 => x = 175/22
Ответ: x = 175/22, y = 29/11.