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36 votes
36 votes
Kevin started with 13$ and added 10$ every week what is the rate of change

User Sarah Richardson
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1 Answer

25 votes
25 votes

The initial amount is $13; then, if x is the number of weeks, after x weeks Kevin will have $13+$10x. Therefore, the equation that models Kevin's money is


y=13+10x

In general, the slope-intercept form of a linear equation is


\begin{gathered} y=mx+b \\ m\to\text{slope} \\ b\to y-\text{intercept} \end{gathered}

Thus,


\begin{gathered} \Rightarrow10x+13=mx+b \\ \Rightarrow m=10 \end{gathered}

Therefore, the slope (rate of change) is $10 per week.

User Chris DeSalvo
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