Y=mx+b since the variable that will increase or deacrease is the number of books then we set it to x x=number of books the member fee is constant so b=10 the amount of money will increase by 5.99 per book so m=5.99
the total amount of money will be our function since it depends on x y=total amount of money y=5.99x+10 total amount of money=5.99(number of books)+membership fee
