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2x + y + z = 0 -> z = -2x-y
6x - 3y + 5z = 6
substitusi
x + y - 3z = 2 6x - 3y + 5z = 6
x + y -3(-2x -y) = 2 6x - 3y +5(-2x -y) = 6
x + y + 6x + 3y = 2 6x - 3y - 10x - 5y = 6
7x + 4y = 2......(4) -4x - 8y = 6
-2x - 4y = 3.......(5)
7x + 4y = 2
4y = 2 - 7x
-2x - (4y) = 3
-2x - (2 - 7x) = 3
-2x - 2 +7x = 3
5x = 3 + 2
5x = 5
x = 1
4y = 2 - 7x
4y = 2 - 7(1)
4y = 2-7
4y = -5
y = -5/4
z = - 2x - y
= -2(1) - (- 5/4)
= -2 + 5/4
= -3/4