The cost of a length of fabric is proportional to the number of yards purchased. The graph shows this relationship.

What is the unit rate for cost per yard?

http://static.k12.com/calms_media/media/1557000_1557500/1557382/1/94c87acbab4862507cd650e33d1ce09e601604a0/MS_IMB-1401029-190411.jpg

Question

The cost of a length of fabric is proportional to the number of yards purchased. The graph shows this relationship.

 

What is the unit rate for cost per yard?

  http://static.k12.com/calms_media/media/1557000_1557500/1557382/1/94c87acbab4862507cd650e33d1ce09e601604a0/MS_IMB-1401029-190411.jpg

phi · Answer

can you tell from the graph how much 5 yds cost ?

rayman5766 · Answer

18

phi · Answer

you can think about this a few ways.  one way
5 yds * cost = 18
cost= 18/5

or you can use ratios:
$$ \frac{18 \ dollars}{5 \ yds}= \frac{x \ dollars}{1 \ yd} $$
and solve for x, (which is not hard.  x= 18/5)

phi · Answer

in other words,  the cost per 1 yd is 18 divided by 5