Which two branches of the government "check" the power of the legislative branch?

There are three branches of government: Executive, Legislative, and Judicial.
The Legislative writes and proposes the laws.
The Executive branch is the branch the president is in and can veto acts of congress (legislative branch), and commands the military.
Lastly the Judicial branch interprets the laws, in the judicial branch is the supreme court (the highest court in the land).
Now, you're asking which TWO branches "check" the power of the LEGISLATIVE branch. With the facts given you can see that the Executive and Judicial branches check the power of the Legislative branch.

Hope this helps!