x + 2y = 0 dengan 2x - y = -5

x + 2y = 0
2x - y = -5

x + 2y = 0
4x - 2y = -10
__________ +
5x = -10
x = -2

Subtitusi x = -2 ke x + 2y = 0

x + 2y = 0
-2 + 2y = 0
2y = 2
y = 1

x, y = {-2, 1}