Question

Tentukan hasil penyelesaian dari
x - y + z = -4
2x + y + 2z = -5
3x - y -z = -5

Answer 1

X - y + z = -4
3x - y -z = -5
___________ +
4x-2y = -9


2x - 2y + 2z = -8
2x + y + 2z = -5
______________-
-3y = -3
y = 1


4x-2(1) = -9
4x -2 = -9
4x = -7
x= -7/4

2x + y + 2z = -5
2(-7/4) + 1 +2z = -5
-7/2 + 1 +2z = -5
-5/2 + 2z = -5
2z= -5+5/2
2z= -10/2+5/2
z= -5/2 × 1/2
z= -5/4

x= -7/4, y = 1, z = -5/4