Jawab dengan caranya ya kak tolong.... Tentukan hp dari

a) 4x + 2y = 12
2x + 2y = 4
---------------------(-)
2x = 8
x = 4
2x + 2y = 4
2(4) + 2y = 4
8 + 2y = 4
2y = 4 - 8
2y = - 4
y = - 2
hp = {4,-2}

b) x + 3y = 9
x + y = 5
--------------------(-)
2y = 4
y = 2
x + y = 5
x + 2 = 5
x = 5 - 2
x = 3
hp = {3,2}

c) x + y = 10
- 2x + y = 1
-------------------(-)
3x = 9
x = 3
x + y = 10
3 + y = 10
y = 10 - 3
y = 7
hp = {3,7}

d) ½ x - y = - 1 (dikali 2)
x - 2y = - 2
x + 2y = 10
----------------(-)
- 4y = - 8
y = 2
x + 2y = 10
x + 2(2) = 10
x + 4 = 10
x = 10 - 4
x = 6
hp = {6,2}