Here are two graphs that represent situations you have seen in earlier activities.

1. The first graph represents a = 450-20r, which describes the relationship between
gallons of water in a tank and time in minutes.

a. Where on the graph can we see the 450? Where can we see the -20?

b. What do these numbers mean in this situation?

2. The second graph represents 6x +9y= 75. It describes the relationship between
pounds of almonds and figs and the dollar amount Clare spent on them.


Suppose a classmate says, "I am not sure the graph represents 6x +9y = 75 because
I don't see the 6, 9, or 75 on the graph." How would you show your classmate that the
graph indeed represents this equation?