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Verified answer
3x - y + 2z = 152x + y + z = 13
------------------------ +
5x + 3z = 28 ===> 5x = 28 - 3z (i)
3x - y + 2z = 15
3x + 2y + 2z = 24
------------------------ -
- 3y = -9 ===> y = 3
2x + y + z = 13 lx2l ===> 4x + 2y + 2z = 26
3x + 2y + 2z = 24 lx1l ===> 3x + 2y + 2z = 24
------------------------ -
x = 2
(i) 5x = 28 - 3z ===> 5 (2) = 28 - 3z
3z = 18
z = 6
jadi x = 2 ; y = 3 dan z = 6 ===> {2, 3, 6} ( A )
semoga jelas dan membantu ya
saya juga sudah coba subtitusi dan benar
semoga membantu