Question

Selesaikan spltv berikut

2x-3y+z=-9
2x+y-z=9
x+y+z=5


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Answer 1

2x - 3y + z = -9
2x + y - z = 9
x + y + z = 5

2x - 3y + z = - 9
2x + y - z = 9
___________ +
4x - 2y = 0

2x - 3y + z = -9
x + y + z = 5
___________-
x - 4y = - 14

4x - 2y = 0 |×2
x - 4y = - 14

8x - 4y = 0
x - 4y = -14
________-
7x = 14
x = 2


x - 4y = -14
2 - 4y = - 14
- 4y = - 16
y = 4

x + y + z = 5
2 + 4 + z = 5
6 + z = 5
z = - 1