tolong dijawab ya please besok dikumpulin (yg dibulatin) pleasee

1) x + y = 7
x - y = 3
---------------(-)
2y = 4
y = 2
subtitusi y = 2 ke pers x + y = 7
x + y = 7
x + 2 = 7
x = 7 - 2
x = 5
hp = {5,2}

3) 3x + 2y = 6
2x - y = 5 |×2
3x + 2y = 6
4x - 2y = 10
-------------------(+)
7x = 16
x = 16/7
subtitusi x = 16/7 ke pers 3x + 2y = 6
3x + 2y = 6
3(16/7) + 2y = 6
48/7 + 2y = 6
2y = 6 - 48/7
2y = 42/7 - 48/7
2y = - 6/7
y = - 6/7 ÷ 2
y = - 6/14
y = - 3/7
hp = {16/7 , - 3/7}

6) x = 2y - 3
x - 2y = - 3
y = 2x + 1
y - 2x = 1
- 2x + y = 1
x - 2y = - 3 |×2
- 2x + y = 1
2x - 4y = - 6
- 2x + y = - 6
-------------------(+)
- 3y = - 12
y = 4
y = 4 subtitusi ke pers x = 2y - 3
x = 2y - 3
x = 2(4) - 3
x = 8 - 3
x = 5
hp = {5,4}

8) 2x - 3y = 3
y = 2x - 1
- 2x + y = - 1
2x - 3y = 3
-------------------(+)
- 2y = 2
y = - 1
y = - 1 subtitusi ke pers 2x - 3y = 3
2x - 3y = 3
2x - 3(-1) = 3
2x + 3 = 3
2x = 3 - 3
x = 0
hp = (0,-1)

9) 5x - y = 3 |×2
10x - 5y = 15
10x - 2y = 6
10x - 5y = 15
-------------------(-)
3y = - 9
y = - 3
subtitusi y = - 3 ke pers 5x - y = 3
5x - y = 3
5x - (-3) = 3
5x + 3 = 3
5x = 3 - 3
5x = 0
x = 0
hp = (0,-3)