Someone answer this fast pls last thing I need to do for tonight

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

What is the difference between the equations of a vertical and a horizontal line?

Answer pls man im trying to get out of summer school