4x-2y=-16.....(¡) 5x-y=4......(¡¡)

4x - 2y = -16 | ×1 |
5x - y = 4 | ×2 |
------------------------- -
4x - 2y = -16
10x - 2y = 8
----------------- -
-6x = -24
x = 4

5x - y = 4
5 (4) - y = 4
20 - y = 4
-y = -16
y = 16