Răspuns :
2x - 5y = 4 2x - 5y = 4
x - y = 5 | *(-2) => -2x+ 2y = -10
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\ - 3y = - 6 => y = 2
↓
x = 5 + 2 = 7
x - y = 5 | *(-2) => -2x+ 2y = -10
----------------
\ - 3y = - 6 => y = 2
↓
x = 5 + 2 = 7