Question

РЕШИТЕ СИСТЕМУ УРАВНЕНИЙ!!!7 КЛАСС АЛГЕБРА,РЕБЯЯЯТ,ПООМОГИТЕ,ПО-БРАТСКИ!

Answer 1

$1); ; left { {{ frac{x}{3}-frac{y}{2}=8; |cdot 6} atop { frac{3x}{8}+frac{y}{4} =22; |cdot 8}} right. ; left { {{2x-3y=48; |cdot 3} atop {3x+2y=176; |cdot (-2)}} right. ; left { {{2x-3y=48} atop {-13y=-208}} right. \\ left { {{2x-3cdot 16=48} atop {y=16}} right. ; left { {{2x=96} atop {y=16}} right. ; left { {{x=48} atop {y=16}} right.$

$2) left { {{ frac{m+1}{5} -frac{3n-5}{10}=-2; |cdot 10} atop { frac{m-3}{6} +frac{5n-9}{4}=2,5; cdot 12}} right. ; ; left { {{2(m+1)-(3n-5)=-20} atop {2(m-3)+3(5n-9)=30}} right. ; ; left { {{2m+2-3n+5=-20} atop {2m-6+15n-27=30}} right.$

$left { {{2m-3n=-27} atop {2m+15n=63}} right. ; ominus ; left { {{2m-3n=-27} atop {-18n=-90}} right. ; ; left { {{2m-3cdot 5=-27} atop {n=5}} right. \\ left { {{2m=-12} atop {n=5}} right. ; ; left { {{m=-6} atop {n=5}} right.$