tolong dibantu ya dikumpulkan sekarang makasih :)

1) 2x - 4y = 6 |×5
3x + 5y = 12 |×4
maka
10x - 20y = 30
12x + 20y = 48
----------------------(+)
22x = 78
x = 78/22
x = 39/11
• 2x - 4y = 6 |×3
3x + 5y = 12 |×2
maka
6x - 12y = 18
6x + 10y = 24
-------------------(-)
- 22y = - 6
y = -6/-22
y = 3/11
hp = ( 39/11 , 3/11)

2) 2x - y + z = 6
x - 3y + z = - 2
-----------------------(-)
x + 2y = 8 ... pers 1
2x - y + z = 6
x + 2y - z = 3
-------------------(+)
3x + y = 9 ... pers 2
pers 1 & 2
x + 2y = 8
3x + y = 9 |×2
maka
x + 2y = 8
6x + 2y = 18
-----------------(-)
- 5x = - 10
x = 2
subtitusi
x + 2y = 8
2 + 2y = 8
2y = 8 - 2
y = 6 ÷ 2
y = 3
subtitusi
2x - y + z = 6
2(2) - 3 + z = 6
4 - 3 + z = 6
z = 6 - 1
z = 5
hp = ( 2, 3 , 5 )