Question

{5Х-2У=19 {7Х-4У=17 РЕШИТЬ УРАВНЕНИЕ СПОСОБОМ ПОДСТАНОВКИ

Answer 1

$left { {5x-2y=19;|:2} atop {7x-4y=17;}} right. textless = textgreater left { {{2,5x-y=9,5;} atop {7x-4y=17;}} right. textless = textgreater left { {{-y=9,5-2,5x;} atop {7x-4y=17;}} right. textless = textgreater \ textless = textgreater left { {{{y=2,5x-9,5;} atop {7x-4({2,5x-9,5)=17;}} right. textless = textgreater left { {{{y=2,5x-9,5;} atop {7x-10x+38-17=0;}} right. textless = textgreater \ textless = textgreater left { {{{y=2,5x-9,5;} atop {-3x=-21;}} right. textless = textgreater left { {{x=7;} atop {5*7-2y=19;}} right. textless = textgreater left { {{x=7;} atop {y=8.}} right.$
Ответ: $(7;8)$.

Answer 2

СПАСИБО БОЛЬШОЕ