Question

СРОЧНО АЛГЕБРА 7 КЛАС!!!​

Answer 1

Ответ:y=6; x=2

Объяснение:

$\left \{ {{3x+y=12} \atop {-3x+5y=24}} \right.$
1.
$3x+y+(-3x+5y)=12+24$
$3x+y-3x+5y=36$
$6y=36$
$y=6$
2.
$3x+y=12$
$y=6$
$3x+6=12$
$3x=6$
$x=2$
3.
$\left \{ {{y=6} \atop {x=2}} \right.$