Question

swe da sirul de rapoarte egale X supra 7 = Y supra 5 = 40 supra Z . determinati X,Y SI Z stiind ca X+Y = 12

DAU COROANA

VA ROG SA MA AJUTATI

Answer 1

$\frac{x}{7} = \frac{y}{5} \ \textless \ =\ \textgreater \ 5x=7y \ \textless \ =\ \textgreater \ x= \frac{7y}{5}$
$\frac{7y}{5} +y=12$
Aducem la numitor comun, 5
$\frac{7y}{5} + \frac{5y}{5} = \frac{60}{5} \ \textless \ =\ \textgreater \ 12y=60 =\ \textgreater \ y=5 si x=7$