Problem 1:


This graph shows the amount of water Melanie can pump over a given period of time

This equation shows the amount of water Lori can pump in a given period of time:

w = 4h


Who pumps water at the faster rate, Melanie or Lori?
This graph shows the number of emails Yolanda writes in a day:

Problem 2:
This graph shows the number of emails Yolanda writes in a day:

This equation shows the number of emails that Zoe writes in a day:

h = 2e

Who has the higher rate of email production, Yolanda or Zoe?

How do you know this to be true?