Learning Targets
Here is a graph that shows the price of blueberries at two different stores. Which store has a better price?
We can compare points that have the same x value or the same y value. For example, the points (2,12)and (3,12) tell us that at store B you can get more pounds of blueberries for the same price.
The points (3,12) and (3,18) tell us that at store A you have to pay more for the same quantity of blueberries. This means store B has the better price.
We can also use the graphs to compare the constants of proportionality. The line representing store B goes through the point (1,4), so the constant of proportionality is 4. This tells us that at store B the blueberries cost $4 per pound. This is cheaper than the $6 per pound unit price at store A.
This activity is tied to the activity called “Tyler’s Walk” from the previous lesson. All references to Tyler going to the bumper cars come from the statements in that activity.
Diego, Lin, and Mai went from the ticket booth to the bumper cars. Descriptions and tables representing their journeys are below.
Meteoroid Perseid 245 and an unknown asteroid were traveling through the solar system. Explore the applet to learn about the distance they had each traveled after a given time.
Important ideas:
2. The graph shows the price, p, of different lengths, L, of two types of rope. If you buy $1.00 of each kind of rope, which one will be longer? Explain how you know.