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se da proportia:
[tex] \frac{x}{y}[/tex]
=
[tex] \frac{7}{5} [/tex]
Aflati numerele x si y stiind ca:
c) 2x+3y=58


Răspuns :

x/y=7/5 =>x=7y/5
2(7y/5) + 3y = 58
14y + 15y = 290
29y = 290 =>y=10
x=(7×10)/5 =>x=14