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8x+6y = 14000
6x+5y = 11200 (pakai metode campuran, saya mau menghilangkan y nya)
40x = 70000
36x = 67200 (kemudian semuanya dikurangkan)
4x = 2800
x = 700
untuk menentukan y nya pilih salah satu
6x+5y = 11200
6(700) + 5y = 11200
4200 + 5y = 11200
5y = 11200 - 4200
5y = 7000
y = 1400
5x + 8y = 5(700) + 8(1400)
= 3500 + 11200
= 14700