Jeffrey and Liz are each saving money for college. Their savings are shown in the graph at right.

1. Based on the graph, who is saving money fastest? Justify your answer.

   Hint (a):

   A steeper slope means that more money is being saved for a given time period.

   Help (a):

   Who has the line with the steepest slope?

2. What is the slope of each line? What does the slope tell you about this situation?

   Hint (b):

   Find the $\frac{\text{rise}}{\text{run}}$ of each line.

   Help (b):

   The slope is the rate at which each person saved money.