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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?

Respuesta :

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

[tex]S=15W+28[/tex]

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.

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