Question

{4-х=у+5 {у-4=14 решить методом потстановки

Answer 1

Весь ответ на листочке

Answer 2

$\left \{ {4-x=y+5} \atop {y-4=14}} \right.\\\\\left \{ {{4-x=18+5} \atop {y=18}} \right.\\\\\left \{ {{4-x=23} \atop {y=18}} \right. \\\\\left \{ {{x=4-23} \atop {y=18}} \right.\\\\\left \{ {{x=-19} \atop {y=18}} \right. \\\\Otvet:\boxed{(-19 \ ; \ 18)}$