The graph below shows the cost of pens based on the number of pens in a pack. What would be the cost of one pen? A graph is shown with title Purchase of Pens. The horizontal axis label is Number of Pens, and the vertical axis label is Cost in dollars. Points are plotted on the ordered pairs 3, 4.50, and 5, 7.50 and 7, 10.50.

A. $1.50

B. $2.30

C. $6.00

D. $13.50
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  A.  $1.50

Step-by-step explanation:

You can probably read the cost from the graph. Find the x-axis position corresponding to 1 pen and locate the point on the graph above that position. Then read the y-coordinate (cost) from the vertical axis. It will be sufficiently close to $1.50 that you can easily determine that to be the correct answer choice.

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Cost per pen is found by dividing cost by pens.

  $4.50/(3 pens) = $1.50 /pen*

* /pen would be pronounced, "per pen."

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