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a fost răspuns

daca x supra y=3 supra 7 , calculează 5x +7y supra 9x-3y. va rogggg e urgenttt.

Răspuns :

Falcuta205
[tex]\frac{x}{y}=\frac{3}{7}\\7x=3y\\x=3k\\y=7k\\5x+7y=3k*5+7k*7=15k+49k=64k\\ 9x-3y=3k*9-7k*3=27k-21k=6k\\\frac{64k}{6k}(simplifcam\ cu\ k)=\frac{64}{6} (simplificam\ cu\ 2)=\frac{32}{3}[/tex]

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