tolong pake cara ya, yang B,C dan D tolong pake caranya. makasih

b) 4x + 3y = -5
-x + 3y = -10
-----------------------(-)
5x = 5
x = 1
4x + 3y = -5
4.1 + 3y = -5
3y = -5 - 4
3y = -9
y = -3
Hp = {1,-3}

c) 2x + 5y = 16
3x - 5y = - 1
----------------------(+)
5x = 15
x = 3
2x + 5y = 16
2.3 + 5y = 16
5y = 16 - 6
5y = 10
y = 2
Hp = { 3,2}

d) 3y - 2y = 4
y = 4
6x - 2y = -2
6x - 2.4 = -2
6x = -2 + 8
6x = 6
x = 1
HP = { 1,4}