tolong dijawab ya menggunakan cara bsk dikumpulkan soalnya

12) m - 2n = 6
2m -n = 9 |×2
maka
m - 2n = 6
4m - 2n = 18
------------------(-)
- 3m = - 12
m = 4
subtitusi ke pers :
m - 2n = 6
4 - 2n = 6
- 2n = 6 - 4
- 2n = 2
n = - 1
hp = ( 4,-1) ( C )

13) x - 2y = 10
3x + y = 16 |×2
maka
x - 2y = 10
6x + 2y = 32
-------------------(+)
7x = 42
x = 6
subtitusi ke pers :
x - 2y = 10
6 - 2y = 10
- 2y = 10 - 6
- 2y = 4
y = - 2
hp = ( 6,-2) ( B )