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Verified answer
X + 2y = 02x - 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}