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Verified answer
5x + 2y = 15 (×2) 10x + 4y = 303x + 4y = 23 (×1) 3x + 4y = 23
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7x = 7
x = 1
3x + 4y = 23
3(1) + 4y = 23
4y = 23 - 3
4y = 20
y = 5
Himpunan penyelesaian = {1,5}