Understanding graphs of proportional relationships

Lessons

1. The graph below shows the cost of chocolate bars.
   
   .
   1. Describe the patterns represented on the graph.
   2. Create a table of values from the graph.
   3. From the graph, estimate the cost of 12 chocolate bars.
   4. It is reasonable to add a point between the ones on the graph? Why or why not?
2. The graph shows the distance a car travels.
   
   .
   1. What does (180, 3) represent?
   2. What is the speed of the car at point A?
   3. Is the graph showing a linear relationship? Why or why not?
   4. It is reasonable to add a point between the ones on the graph? Explain.