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y = jeruk
menghitung x:
5x + 2y = 82.500 | dikali 1
3x + y = 47.500 | dikali 2
--------------------------------------
5x + 2y = 82.500
6x + 2y = 95.000
------------------------- --- ( dikurang )
-1x = -12.500
x = 12.500
menghitung y:
5x + 2y = 82.500 | dikali 3
3x + y = 47.500 | dikali 5
--------------------------------------
15x + 6y = 247.500
15x + 5y = 237.500
-------------------------- --- ( dikurang )
y = 10.000
Jawaban untuk pertanyaan:
4x + 3y = 4(12.500) + 3(10.000) = 50.000 + 30.000 = Rp.80.000,-