Question

at the beginning of the year Adrian's savings account balance was $28 each week he deposits another $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?

Answer 1

Let W be the number of weeks in a year and S be the saving account balance. Then, Adrian's saving account formula is

`S=15W+28`

so, no, his saving account balance is not proportional because there is a constant term equal to 28. If this last constante was zero the, the answer will be yes.