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SE CONSIDERA PROPORTIA X SUPRA Y = 4 SUPRA 5
DETERMINATI: X+Y SUPRA Y


Răspuns :

[tex] \frac{x}{y} = \frac{4}{5} =>5x=4y=>x= \frac{4y}{5} [/tex]

[tex] \frac{x+y}{y} = \frac{ \frac{4y}{5}+y }{y} = \frac{9y}{5y} = \frac{9}{5} [/tex]