X > 5 and x < 8 Plot the endpoints. Select an endpoint to change it from closed to open. Select the middle of a segment, ray, or line to delete it. i need help!

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?