Whoever answers gets brainlist!

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236