tolong di bantu soal no 1 dan 3..

1) y = 2x - 3
3x + 2y = 8
3x + 2(2x - 3) = 8
3x + 4x - 6 = 8
7x = 8 + 6
7x = 14
x = 2
subtitusi
y = 2x - 3
y = 2(2) - 3
y = 4 - 3
y = 1
hp = ( 2,1 ) ( A )

2) 3x + 2y = 19
2x - y = 1 |×2
maka
3x + 2y = 19
4x - 2y = 2
------------------(+)
7x = 21
x = 3
subtitusi
2x - y = 1
2(3) - y = 1
6 - y = 1
- y = 1 - 6
- y = - 5
y = 5
nilai 4x - 5y
= 4(3) - 5(5)
= 12 - 25
= - 13 ( B )

3) 3x + 2y = 9 |×5
2x + 5y = 17 |×2
maka
15x + 10y = 45
4x + 10y = 34
---------------------(-)
11x = 11
x = 1
subtitusi
2x + 5y = 17
2(1) + 5y = 17
2 + 5y = 17
5y = 17 - 2
5y = 15
y = 3
hp = ( 1 ,3 )
jadi jawabannya ( B )