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x=6,2 zł
2,3 y = 2,3 kg pomarańczy
x = 4,65 zł
y = ?
1,4x + 2,3y = 20,77 zł
1,4 * 4,65 + 2,3y = 20,77
6,51 + 2,3y = 20,77
2,3y = 20,77 - 6,51
2,3y = 14,26 //:2,3
y = 6,2
1 kg pomarańczy kosztuje 6,2 zł