Question

Philip want some replace existing fence. He received a quote from the general contractor based on the graph below. The graph shows the cost of the new cedar fence based on the numbers of feet.

Answer 1

1) The unit rate compares an increase in y with increases in x.

2) To find the unit rate, choose two points. Let's choose (20, 400) and (60, 1200).

3) The unit rate (r) will be the difference in x divided by the difference in y:

`r=(1200-400)/(60-20)`

4) Now you can find r by solving the division.

`\begin{gathered} r=(800)/(40) \\ r=20 \end{gathered}`

Answer: The unit rate is $20/foot.

Alternative C.