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Aflati x si y daca x /y=3/5 2× -y=9

Răspuns :

2x-y=9 → y=2x-9
x/y=3/5 → 5*x = 3*y → 5*x=3*(2x-9) → 5*x=6*x-27 → 6*x-5*x=27 → x=27
y=2x-9=2*27-9=54-9=45
Deci
x=27
y=45