The first step in solving the equation is adding 11 to both sides, as follows:
[tex]2y-11+11=25+11\Rightarrow2y=36[/tex]
In this way, we can start solving the equation for y.
Therefore, the correct option is B: add 11 to both sides.
(This is called Addition Property of Equality: adding the same number to both sides in any equation.)
