Having trouble computing dynamic multipliers for a 2 variable VAR model, please help.

#1
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I am so lost on this question I do not even know where to start. I know that yt can be 1 or 2, and xt can be -4 or 3. Then i know yt-1 is and xt-1 are the lagged values of both yt and xt. However, this is the extent of my knowledge, any help on how to solve or the next steps I should take would be very appreciated, thanks!