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Onedirection2002
a fost răspuns

determinati numerele x si y, stiind ca 2x+5y/3x+2y= 15/13 si x+y=12

Răspuns :

Danamocanu71
15[3x+2y]=13[2x+5y]
⇒45x+30y=26x+65y
⇒45x-26x=65y-30y
⇒19x=35y
⇒x+y=12
⇒x=35y/19;
⇒35y/19+y=12
⇒35y/19+19y/19=12
⇒54y/19=12
⇒y=19·12/54
⇒y=19·6/28
⇒y=19·3/14
⇒y=4,07;
⇒x=7,5;

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