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y - 2z = -3 ...(2)
z + y = 1 ...(3)
• Eliminasi pers (2) dan (3)
y - 2z = -3
z + y = 1
________ _
- 3z = -4
z = 4/3
• substitusi z = 4/3 ke pers (1)
2x + z = 10/3
2x + 4/3 = 10/3
2x = 10/3 - 4/3
2x = 2
x = 1
• substitusi z = 4/3 ke pers (3)
z + y = 1
4/3 + y = 1
y = 1 - 4/3
y = - 1/3
maka x + y + z = 1 + (-1/3) + 4/3 = 1 + 3/3 = 1 + 1 = 2