Answer 1

The easiest way is to declare your matrices as numpy arrays and just do
matrix1 + matrix2

More on numpy here:
https://www.sololearn.com/learn/6671/?ref=app

But if that's not an option, here's an alternative:

new_matrix =[[matrix1[i][j] + matrix2[i][j] for j in range(Y)] for i in range(X)]

If nested list comprehension is not your cup of tea, try

#initialize matrix
new_matrix = []
for i in range(X):
#initialize i-th row
new_matrix.append([])
for j in range(Y):
new_matrix[i].append(matrix1[i][j] + matrix2[i][j])

Hope that helps.