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5x + 4y = 50.000 (kalikan 3)
2x + 3y = 27.000 (kalikan 4)
jadi,
(15x + 12y) - (8x + 12y) = 150.000 - 108.000
7x = 42.000
x = 6.000
2x + 3y = 27.000
2(6000) + 3y = 27000
3y = 27000 - 12000
3y = 15000
y = 5000
nah tinggal masukin x sama y ke pertanyaannya,.