Question

Alicia bought a notebook and several erasers at the student store. The graph shows the relationship between the total cost of her items and the number of erasers she purchased.



A graph shows number of erasures labeled 1 to 9 on the horizontal axis and total cost (dollar sign) on the vertical axis. A line increases from 0 to 5.

What is the cost of each eraser?

$1.00
$1.50
$2.00
$3.50

Answer 1

$2.00

The line shows the total is $5 when there are 0 erasers (the notebook cost) and $15 when there are 5 erasers. The eraser cost is the slope: (15 − 5) / (5 − 0) = 10/5 = $2 per eraser.