Question

решите методом cложения систему уравнения {2x+3y=7. 7x-3y=11

Answer 1

$+left {{ bigg {2x + 3y = 7} atop bigg { 7x - 3y = 11}} right. \ --------- \ 2x + 7x = 7 + 11 \ 9x = 18 \ x = 2 \ \ 2x + 3y = 7 \ 2 cdot 2 + 3y = 7 \ 4 + 3y = 7 \ 3y = 3 \ y = 1 \ \ OTBET: (2; 1).$