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?
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Answer: Account balance is not proportional to the number of weeks. Step-by-step explanation: Initially Adrian's saving account balance was = $28 He deposits $15 in his account each week. If we denote week with a variable 'x' then after 'x' weeks total amount in is account = $15x So, total amount in his account after 'x' week will be; y = 15x + 28 It's a linear equation representing total amount after 'x' weeks with a constant growth rate of 15 and initial amount 28. In other words equation is in the form of y = mx +b. This equation doesn't show the proportional relation because equation in the form of y = kx represents the relation of proportionality only.
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