Question

{5x+2y=1
{y-x=4
Пожалуйста помогите!!!!!!

Answer 1

$\left \{ {{5x+2y=1} \atop {y-x=4}} \right.$
$\left \{ {{5x+2*(4+x)=1} \atop {y=4+x}} \right.$
$\left \{ {{5x+8+2x=1} \atop {y=4+x}} \right.$
$\left \{ {{7x=1-8} \atop {y=4+x}} \right.$
$\left \{ {{7x=-7} \atop {y=4+x}} \right.$
$\left \{ {{x=-1} \atop {y=4+(-1)}} \right.$
$\left \{ {{x=-1} \atop {y=3}} \right.$