Решите систему
-3х+7у=29
6х+5у=13

-3х+7у=296х+5у=132*(-3х)+2*7у=2*296х+5у=13-6х+14у=586х+5у=13-6х+6х+14у+5у=58+1319у=71у=71/196х+5 * 71/19=136х+355/19=136х=13-355/196х=19*13/19 - 355/196х= 247/19-355/196х=-108/19х=-108/19 : 6х=-108/19 * 1/6х=-108*1/19*6х=-108/114х=-18*6/19*6х=-18/19Проверка-3 * (-18/19)+7 * 71/19=54/19+ 497/19 = 551/19 = 296* (-18/19) + 5 * 71/19 = -108/19+ 355/19 = 247/19=13