Question

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

$6.75
$3.37
$1.25
$0.80

Answer 1

since 3 pens cost $3.75, then one pen costs $1.25.

Answer 2

C. $1.25

Explanation:

We have been given a graph that shows the cost of pens based on the number of pens in a pack. We are asked to find cost of one pen.

The cost of one pen would be equal to slope of line that connects the given points.

First of all, we will find slope of our given line using points
`(3,3.75)` and
`(9,11.25)` in slope formula.

`m=(y_2-y_1)/(x_2-x_1)`, where,

`y_2-y_1` = Difference between two y-coordinates,

`x_2-x_1` = Difference between two x-coordinates of same y-coordinates.

Upon substituting our given values in slope formula, we will get:

`m=(11.25-3.75)/(9-3)`

`m=(7.5)/(6)`

`m=1.25`

Therefore, the cost of one pen is $1.25 and option C is the correct choice.