Definition: agree (be of the same opinion)
Gloss: your answer agree same-you-me
English equivalent: Your answer agrees with mine.
The part same-you-me can be used with one handshape. In this case, a meaning can be slightly different. With one handshape, it would connote more likely too. "I agree with you, too." With two handshapes in the context of this sentence, it implies that "you and I are in the same shoe."