Ratios

4x = 3y

x = $\frac{3}{4}y$ 

$\frac{2x+y}{3x+4y}$ 

$\frac{\frac{6}{4}y + y}{\frac{9}{4}y + 4y}$ 

 $\frac{\frac{10}{4}y}{\frac{25}{4}y}$ 

$\frac{10y}{25y}$ 

$\frac{2y}{5y}$ 

$\boxed{\frac{2}{5}}$