Question

The following chart shows the number of months a savings account has been open and the balance of the account. Find the slope of the line through these points. Number of Balance Months (dollars) 1 $400 5 $800 7 $1,000 10 $1,300 D 80 D. 100 UD 100 80

Answer 1

To find the slope, let us take two y-values and two x-values. This becomes

`\begin{gathered} y-\text{values 800 and 400} \\ x-\text{values 5 and 1} \end{gathered}`

The slope becomes

`\begin{gathered} m=\frac{change\text{ in y}}{\text{change in x}} \\ m=(800-400)/(5-1) \\ m=(400)/(4) \\ m=100 \end{gathered}`

Hence the answer is 100, the third option.