Irene R. answered • 30d

BS in Mechanical Engineering and Certified math teacher for 13 years

The unit rate is the cost of one item. For these pencils, $12 for 6 packs has a unit rate of $2 for 1 pack.

Using this unit rate, we can multiply by p to determine the cost of 9 packs:

$2 * 9 = $18 for 9 packs