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4x+7y/5x,x/y=2 Domeniul:Rapoarte si proporții......URGENT!!!!vă rog

Răspuns :

Metoda  I
x/y=2 ⇒ x=2y
4x+7y/5x= 4*2y+7y/5*2y= 8y+7y/10y=15y/10y=3/2

Metoda II
x/y=2=k
x=2k si y=k
4*2k+7k/5*2k=8k+7k/10k=15k/10k=15/10=3/2=1,5