Stackable polystyrene cups have a height $h_{1} = 8$ cm.

Two stacked cups have a height of $h_{2} = 10$ cm.
Three stacked cups have a height of $h_{3} = 12$ cm.
Find the equation for $h_{x} =$$x +$

Your friend is $160$cm tall.
Find out how many cups you will need to reach the height of your friend. $cups =$