What's the value of x and what's the length of eg

For what value of jn is mn parallel to kl

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Abbey purchased a house using a fixed rate mortgage. the annual interest rate is 4.2% compounded monthly for 20 years. the mortgage amount is $235,000. what is the monthly payment on the mortgage? this isn't a multiple choice question have to show my work