Question: How do I use the 'solve' function in a matrix?

Hello, I have quite a complex thing to solve, but would simplify it here. I would like to solve the unknown in a matrix, how can I use the 'solve' function? For example

A:=Matrix(3,1,4)
B:=Matrix(3,1,[2,7,9])
The relation between them is A=B*y

How can I use the below function?
solve(A=B*y,y)

 

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