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Jane is saving to buy a cell phone. She is given a $100 gift to start and saves $35 a month from her allowance. So after one month, Jane has saved $135. Does it make sense to represent the relationship between the amount saved and the number of months with one constant rate? Why or why not? Explain your answer.

User Amr Bahaa
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1 Answer

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17 votes

Jane is given a $100 gift to start and saves $35 a month from her allowance.

After 1 month, Jane has saved

After 2 months, Jane has saved

After three months, Jane has saved

and so on

In general, after x months Jane has saved

This means that it makes sense to represent the relationship between the amount saved and the number of months with one constant rate (in this case the constant rate is 35). It makes sense because the amount of money increases by $35 each month. Since the amount of increase is constant, we get constant rate. Also the initial amount is known ($100), so there is a possibility to write the equation of linear function representing this situation.

Explanation:

User Scadge
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