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20x + 25y = 45
20x - 16y = 4
------------------ ( - )
41y = 41
Diperoleh y = 1
Substitusikan, pilih ke persamaan-1
4x + 5(1) = 9
4x = 4
Diperoleh x = 1
Jadi penyelesaiannya (1, 1)
Barangkali yang dimaksud x₁ = x dan x₂ = y
Sehingga x₁ + x₂ = 1 + 1 = 2