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x=y
czyli
{y+y+z=4
{y+2y+3z=9
2y+z=4
3y+3z=9 //3
2y+z=4
y+z=3
odejmujemy stronami
y=1
z=2
x=1
{x+y+z=4
{x+2y+3z=9
{x = y
podstawiamy
{x + x + z = 4
{x + 2x + 3z = 9
{2x + z = 4
{3x + 3z = 9 /:3
{x + z = 3
{2x + z = 4
{x = 3 - z
{2 (3 - z) + z = 4
6 - 2z + z = 4
-z = 4 - 6
-z = -2
z = 2
x = 3 - 2
x = 1
{x = 1
{y = 1
{z = 2