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3x+2y-2z = 0 (1)
5x+3y+4z=36 (2)
2x - y - z = -3 (3)
(1) 6x+4y-4z = 0
(2) 5x+3y+4z=36
-------------------- +
11x+7y = 36 (4)
(1) 3x+2y-2z = 0
(3) 4x-2y-2z = -6
--------------------- -
-x+4y = 6 (5)
(4) 11x+7y = 36
(5) -11x+44y = 66
----------------------- +
51y = 102
y = 2
(5) -x+4(2) = 6
x = 8-6
x = 2
(3) 2(2)-2-z = -3
z = 4-2+3
z = 5
8)kalikan KPK setiap persamaan
9x-20z = 49 (1)
35x+9y = 44 (2)
2y + 5z = -8 (3)
(3) 2y = -8-5z
y = -8-5z / 2
(2) 35x+9(-8-5z / 2) = 44
70x + 9(-8-5z) = 88
70x - 72-45z = 88
70x = 88+72+45z
= 160+45z
x = 160+45z / 70
(1) 9 ( 160+45z / 70) - 20z = 49
9 (160+45z) - 1400z = 3430
1440 + 405z - 1400z = 3430
-995z = 3430-1440
= 1990
z = -2
(2) x = 160 +45(-2) / 70
= 160-90 / 70
= 70/70
x =1
(1) y = -8-5(-2) / 2
= -8+10 / 2
= 2/2
y =1