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x + 2y = 9
-5x + 2y = 27
------------------- -
6x = 9 - 27
x = -18/6
x = -3
Subtitusi:
x + 2y = 9
-3 + 2y = 9
2y = 9 + 3
y = 12/2
y = 6
Maaf kalau benar ya kak, soalnya dikelas memang saya gak terlalu cerdas.