Get closest value array for array of arrays.

[DreamingInsanity]

Title is quite confusing let me explain:
If I have an 2D array of values 'y': [[10,20,10],[30,20,10],[10,10,10],[45,37,34]]
and a singular array 'x': [25,18,9]
I want to be able to run function findClosestArray(x, y) which will return

Output:
[30,20,10]

because that is the closest array to the one I provided.
If I ran findClosestArray(x, y) with 'x' NOW being [43,37,30] it would return

Output:
[45,37,34]

It's very similar to this:

myList = [6,6,10,50,24,457,24]
myNumber= 9
a = min(myList, key=lambda x:abs(x-myNumber))
print(a)

(which would return 10)
but instead with arrays.

How can I do this?