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A.
4x - 2y = 2|× 1
x + y = 5|× 2

4x - 2y = 2
2x + 2y = 10
_________+
6x = 12
x = 2

4x - 2y = 2|× 1
x + y = 5|× 4

4x - 2y = 2
4x + 4y = 20
_________—
- 6y = - 18
y = 3

B.
3x + 4y = 14|× 5
x + 5y = 12|× 4

15x + 20y = 70
4x + 20y = 48
___________—
11x = 22
x = 2

3x + 4y = 14|× 1
x + 5y = 12|× 3

3x + 4y = 14
3x + 15y = 36
__________—
- 11y = - 22
y = 2

Maaf Kalau Salah