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spidol = b
4a + 2b = ?
jawab:
2a + 3b = 18 | x 3 | 6a + 9b = 54
3a + 5b = 29 | x 2 | 6a + 10b = 58
__________________________ _
-b = -4
b = 4
2a + 3b = 18
2a + 12 = 18
2a = 6
a = 3
4a + 2b
4(3) + 2(4)
12 + 8
20
jadiJumlah Uang yg harus dibayar Ady adalah Rp.20.000