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b) x supra y =2 supra 7
x + y = 18


Răspuns :

[tex]\frac{x}{y}=\frac{2}{7} \Rightarrow \frac{x}{2}=\frac{y}{7}=k \Rightarrow x=2k, y=7k\\ x+y=18\\ 2k+7k=18\\ 9k=18 \Rightarrow k=2\\ x=2k \Rightarrow x=4\\ y=7k \Rightarrow y=14[/tex]