Question

Вот так вот)))
Нужна ваша помощь

Answer 1

$left { {5x-y=7} atop {3x+2y=-1}} right.$
$left { {y=5x-7} atop {3x+2y=-1}} right.$
$left { {y=5x-7} atop {3x+2(5x-7)=-1}} right.$
$left { {y=5x-7} atop {3x+10x-14=-1}} right.$
$left { {y=5x-7} atop {13x=13}} right.$
$left { {y=5x-7} atop {x=1}} right.$
$left { {y=-2} atop {x=1}} right.$