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6x - 2y = 36
5x + 2y = 8
- - Jumlah - -
11x = 44
x = 4
Lalu, untuk y:
3x - y = 18
3(4) - y = 18
12 - y = 18
y = 12 - 18
y = -6
Sehingga. a = 4, dan b = -6
Maka dari itu:
2a + 3b = 2(4) + 3(-6)
2a + 3b = 8 - 18
2a + 3b = -10