Two accounts earn simple interest. the balance yy (in dollars) of account a after xx years can be modeled by y=10x+500y=10x+500. account b starts with $400 and earns 5% simple annual interest.
a. which account has a greater principal?

question 2
how much greater is the principal? $

question 3
b. which account has a greater annual interest rate?

question 4
how much greater is the annual interest rate?
%