Решите методом подстановки
Система уравнений
{ х+у=7
{ 2х+у=8
__________
{х-у=-2
{х-2у=4
_________
{х-2у= -8
{х-3у= -8
_________
{3x+2y= 7
{ x-2y= -3
_________
{ m-3n= 8
{ 2m-3n= 10
Система уравнений
{ х+у=7
{ 2х+у=8
__________
{х-у=-2
{х-2у=4
_________
{х-2у= -8
{х-3у= -8
_________
{3x+2y= 7
{ x-2y= -3
_________
{ m-3n= 8
{ 2m-3n= 10
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Answers & Comments
x=-2+y
-2+y-2y=4
-2-y=4
y=-6
x=-2+(-6)
x=-8
Ответ(8;-6)