Which would be appropriate accepts or accept

thanks in advance for answering the following question. I am trying to figure out which one would be correct. I am in process of writing documentation on a technical subject and I was asked to replace 'accepts' with 'accept'. But not sure why.

1. Both 'right-click'and 'double-click' accept 2 parameters
2. Both 'right-click'and 'double-click' accepts 2 parameters

-Murali

Solution 1:

Build it in steps with this example:

Alice likes apples.
Bob likes apples.
Alice and Bob like apples.
Both Alice and Bob like apples.

I hope it is now clear why the sentence should read

Both 'right-click' and 'double-click' accept 2 parameters.