How can I combine these 2 tables to make a login system?

So I have made 2 tables that contain data so that we have have a login system, I have 2 text boxes and then a text button that will be displayed into the screen. How can I combine the tables so that array[2] goes with array[2] and etc.

Here are the tables-

local UsernameArray = {1,25}
UsernameArray[1] = "X"
UsernameArray[2] = "X"
UsernameArray[3] = "X"
UsernameArray[4] = "X"
UsernameArray[5] = "X"

local PasswordArray = {1,25}
PasswordArray[1] = "x"
PasswordArray[2] = "x"
PasswordArray[3] = "x"
PasswordArray[4] = "x"
PasswordArray[5] = "x"

Thank you