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3.208 x 4 = 12.832
Total seluruhnya = 41.707
Gitu bukan ya???
misal harga 1kg salak = y
diketahui x = 3y
4x + 5y = 38.500
substitusikan nilai x = 3y pada persamaan
4(3y) + 5y = 38.500
12y + 5y = 38.500
17y = 38.500 y = 2264,7
maka nilai 3x + 4y = 3(3y) + 4y = 9y + 4y = 13y = Rp.29441 ≈ Rp.29.500