Question

/ inseamna supra stiind ca

x/y = 2/7 calculati 2x+3y / 5y

Answer 1

din proportii derivate => x\y=2\7 => y=2 x=7 , 2x+3y\5 => 2*7+3*2\5 => 14+6\5 si se amplifica 14 cu 5 si vine 70\5+6\5 = 76\5 

Answer 2

a)$\frac{x}{y} = \frac{2}{7}$
$x= \frac{2y}{7}$
7x=2y
$\frac{7x}{7} = \frac{2y}{7}$
$x= \frac{2}{7}y$