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{ x+y=6 |*(-2)
{2x-y=5
{-2x-2y=-12
{2x-y=5
+___________
-3y=-7
y=7/3
2x-7/3=5
2x=(15-7)/3
2x=8/3
x=8/6
{x=8/6
{y=7/3
2.)
{ x+y=3
{3x+3y=9
{x=3-y
{3(3-y)+3y=9
{x=3-y
{9-3y+3y=9
{x=3-y
{9=9
układ nieoznaczony
3.)
{ x+y=4
{2x+2y=12
{x=4-y
{2(4-y)+2y=12
{x=4-y
{8-2y+2y=12
{x=4-y
{8=12
ukł. sprzeczny