{7х+7у=105 {2х=3у Пж решите метоодом ПОДСТАНОВКИ ЭТУ СИСТЕМУ

⇒⇒⇒⇒⇒[latex] \left \{ {{7x+7y=105} \atop {2x=3y}} \right \left \{ {{7x=105-7y} \atop {2x=3y}} \right. \left \{ {{x=15-y} \atop {2*(15-y)=3y}} \right. \left \{ {{x=15-y} \atop {30=5y}} \right. \left \{ {{x=15-y} \atop {y=6}} \right. \left \{ {{x=9} \atop {y=6}} \right. [/latex]