Odpowiedź :
-x+y=-1
2x+y=-4
y=x-1
2x+x-1=-4
y=x-1
3x=-3 /:3
y=x-1
x=-1
y=-1-1
x=-1
y=-2
x=-1
2x+y=-4
y=x-1
2x+x-1=-4
y=x-1
3x=-3 /:3
y=x-1
x=-1
y=-1-1
x=-1
y=-2
x=-1
-x+y=-1
{2x +y = -4
y=x-1
{2x+x-1=-4
y=x-1
{3x=-3 /: (-3)
y=x-1
{x=-1
y=-1-1
{x=-1
y=-2
{x=-1
{2x +y = -4
y=x-1
{2x+x-1=-4
y=x-1
{3x=-3 /: (-3)
y=x-1
{x=-1
y=-1-1
{x=-1
y=-2
{x=-1
-x+y=-1
{2x +y = -4
y=x-1
2x+y=-4
y=x-1
2x+x-1=-4
y=x-1
3x=-4+1
y=x-1
3x=-3/3
y=x-1
x=-1
y=-1-1
x=-1
y=-2
x=-1
{2x +y = -4
y=x-1
2x+y=-4
y=x-1
2x+x-1=-4
y=x-1
3x=-4+1
y=x-1
3x=-3/3
y=x-1
x=-1
y=-1-1
x=-1
y=-2
x=-1