tolongvjawab ya sy mohon

1)...2x+3y=28. (dikali 3)
3x-4y=-9. (dikali 2)

6x+9y=84
6x-8y=-18
_________-
17y=102
y=6

2x+3(6)=28
2x=28-18
2x=10
x=5

2)...7x-5y=11. (dikali 3)
3x+4y=17. (dikali 7)

21x-15y=33
21x+28y=119
Dikurang
-43y=-86
y=2

3x+4(2)=17
3x=17-8
3x=9
x=3

3)...6x+7y=32. (dikali 1)
9x+y=29. (dikali 7)
6x+7y=32
63x+7y=203
Dikurang
-57x=-171
x=3

9(3)+y=29
27+y=29
y=29-27
y=2

4)...28m-15n=41. (dikali 13)
21m+13n=55. (dikali 15)
364m-195n=533
315m+195n=825
Ditambah
679m=1358
m=2

21(2)+13n=55
42+13n=55
13n=55-42
13n=13
n=1

Jdkn jwbn yg terbaik ya... Cape astgaa