Examples of this are:
2 and 
2 and 
4 and 
I'm guessing you have a work sheet going along with this which has actual images of containers. I've attached an example - if you can post the actual work sheet you're referring to I can edit this answer to correctly reflect your specific question.
Answer:
hard question you got there
Step-by-step explanation:
Start with y = mx + b. Subst. -34 for m and 5 for b: y = -34x + 5