Question 166728
{{{6x^2/y^2  + 5x^2/y^2}}}

Algebraic fractions 'work' just like normal old fractions. In order to add or subtract fraction, they have to be over a common denominator. Once that is done, you just add them

In this problem, both fractions are over the same denominator {{{1/y^2}}} so just add them 
{{{6x^2/y^2  + 5x^2/y^2}}}
{{{11x^2/y^2}}}