A bullet is moving at vector (2,1) & ricochets off a wall with ends at (4,5) and (8, 10) . X value?

If you could tell me how to solve this or an answer, both would be really appreciated. This is a math problem I was not in class to learn how to do an

If you could tell me how to solve this or an answer, both would be really appreciated. This is a math problem I was not in class to learn how to do and while I've been researching as much as I can I just can't seem to get it.

or:If you could tell me how to solve this or an answer, both would be really appreciated. This is a math problem I was not in class to learn how to do and while I've been researching as much as I can I just can't seem to get it.

or:What you have presented here is not complete. There is no answer when you don't know what the question is.

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