Which equation represents the linear function that is shown on the graph below? On a coordinate plane, a line goes through points (4, 0), (6, 1), (8, 2), and (10, 3).
y = one-half x + 4
y = one-half x minus 2
y = 4 x minus 2
y = negative 2 x + 4

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?