#### Answer

$\frac{11y}{12}$

#### Work Step by Step

By inspection, we see that the LCM of the denominators is $12$. Therefore, we create a common denominator to obtain:
$\frac{y}{6}+\frac{3y}{4}$
$=\frac{2(y)+3(3y)}{12}$
$=\frac{2y+9y}{12}$
$=\frac{11y}{12}$