Question

найдите решение систем уравнений
(3-7х)у + 7у(х+9)= 264
х(4-у)=у(8-х)-34

Answer 1

$left { {{(3-7x)y+7y(x+9)=264} atop {x(4-y)=y(8-x)-34}} right. left { {{3y-7xy+7yx+63y=264} atop {4x-xy-8y+yx=34}} right. left { {{66y=264} atop {4x-8y=34}} right. \ left { {{y= frac{264}{66} } atop {4x-8y=34}} right. left { {{y=4} atop {4x-8*4=34}} right. left { {{y=4} atop {4x=34+32}} right. left { {{y=4} atop {x=16,5}} right.$