2x - y + z =6 x - 3y + z = -2 x + 2y - z = 3 a.Nilai x yang memenuhi sistem persamaan tersebut adalah... b.Nilai y yang memenuhi sistem persamaan tersebut adala

(2x - y + z = 6) - (x- 3y + z= -2)
(2x-y+z=6) - (2x-6y+2z=-4)
5y - z = 10 ---------> persamaan 1


(x- 3y + z= -2) - (x + 2y - z = 3)
-5y + 2z = -5
5y - 2z = 5 -------------> persamaan 2

(5y - z = 1) - (5y - 2z = 5)
z = - 4 ------------> c


2x - y + z =6

2x -y -4 = 6
2x -y = 6 + 4
2x - y = 10 -----------------> persamaan 3



x + 2y - z = 3

x + 2y + 4 = 3
x + 2y = 3-4
x +2y = -1
2x + 4y = -2 -----------------> persamaan 4

(2x - y = 10) - (2x + 4y = -2)
-5y = 12
y = 12/-5 ------------> b






2x + 12/5 -4 = 6
2x = 6 - 12/5 + 4
2x = 30/5 -12/5 + 20/5
2x = 38/5
x = 76/5
x = 15.2