tentukan nilai dari x,y, dan z persamaan berikut 1). x + y + z = 1 . 2x + 3y - z = 8 . 4x - y + 3z = 6 2). 3x - y + 4z = 8 . 5x + y + 2z = 12 .

x + y + z = 1
x = 1 - y - z

2x + 3y - z = 8
2(1-y-z) + 3y - z = 8
2 - 2y - 2z + 3y - z = 8
2 + y - 3z = 8
y - 3z = 6

4x - y + 3z = 6
4(1-y-z) - y + 3z = 6
4 - 4y -4z - y + 3z = 6
4 - 5y - z = 6
-5y - z = 2

y - 3z = 6.....x5
-5y - z = 2....x-1
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5y - 15z = 30
5y + z = -2
---------------  -
-16z = 32
z = -2

y - 3z = 6
y - 3(-2) = 6
y + 6 = 6
y = 0

x = 1-y-z = 1-0-(-2)=3