Question

/7 х +9у +48=0
\6х+3у+27=0
это скобки

Answer 1

$\left \{ {{7x+9y+48=0} \atop {6x+3y+27=0}} \right.\\\\ \left \{ {{7x+9y=-48} \atop {6x+3y=-27|*(-3)}} \right.\\\\ \left \{ {{7x+9y=-48} \atop {-18x-9y=81}} \right. +\\\\ \\-11x=33\\x=33:(-11)\\x=-3\\\\7(-3)+9y=-48\\-21+9y=-48\\9y=-48+21\\9y=-27\\y=-27:9\\y=-3$

Ответ: х=-3, у=-3