Ответ:
{2x+y=4
{x+y=5
{y=5-x
2x+5-x=4
x+5=4
x=4-5
x=-1
y=5-(-1)
y=5+1
y=6
(x,y)=(-1,6)
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Ответ:
{2x+y=4
{x+y=5
{2x+y=4
{y=5-x
2x+5-x=4
x+5=4
x=4-5
x=-1
y=5-(-1)
y=5+1
y=6
(x,y)=(-1,6)