How do you find the written answer for 8,000 minus 4,615 to get answer

Find solution of the linear equation y = 2/3x + 1/3

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?