MATH 7 B: GRAPHING IN THE COORDINATE PLANE UNIT

Name Date

Find the Best Price MATH 7 B: GRAPHING IN THE COORDINATE PLANE UNIT

Directions: Your shopping list for this week consists of six items that are available at two different grocery stores and are featured in their weekly ads. You want to do some comparison shopping and find the best price for each item.

You will analyze the prices by graphing them together on a coordinate grid and finding the unit price. Unit prices are sometimes very close, and the price difference may not be worth going to a different store to save a few pennies.

My Shopping List Find two grocery store weekly ad circulars that feature similar products. You can find the circulars online or in a printed newspaper.

Select six items in the ads that your family uses. Be sure the same item, or something very similar, is offered at both stores. The grocery items can be just about anything the store offers (i.e., bakery items, fresh produce, dairy products, pre-packaged or frozen items, paper or cleaning products, etc.).

Complete your shopping list with the name of each item and the advertised prices at the two stores.

Example Grocery Item Advertised

Price at Store 1

Advertised Price at Store 2

Greek yogurt (individual cups) 4 for $3.49 5 for $5.00

oranges 10 for $10.00 $0.99 each

My Shopping List Grocery Item Advertised

Price at Store 1

Advertised Price at Store 2

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Grocery Item Advertised Price at Store 1

Advertised Price at Store 2

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Price Comparison Complete the tables for each item to show the cost of 1, 2, 3, 4, 5, and 6 of the item at each store. Write the equation that describes the proportional relationship.

Plot the (quantity, price) coordinate pairs for each item on one coordinate grid. Choose an appropriate scale for each axis. Label each line you graph with the store number.

Make your decision about where you will get the best price for the item and explain your reasoning.

Item:

Store 1

Quantity Price

Equation

Store 2

Quantity Price

Equation

Where I will purchase the item:

Why:

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1. Grocery Item - 2:
2. Grocery Item - 3:
3. Grocery Item - 4:
4. Grocery Item - 5:
5. Grocery Item - 6:
6. Advertised Price at Store 2 - 1:
7. Advertised Price at Store 1 - 2:
8. Advertised Price at Store 1 - 3:
9. Advertised Price at Store 1 - 4:
10. Advertised Price at Store 1 - 5:
11. Advertised Price at Store 1 - 6:
12. Advertised Price at Store 2 - 2:
13. Advertised Price at Store 2 - 3:
14. Advertised Price at Store 2 - 4:
15. Advertised Price at Store 2 - 5:
16. Advertised Price at Store 2 - 6:
17. Advertised Price at Store 1 - 1:
18. Store 1 Quantity - 2:
19. Store 1 Quantity - 3:
20. Store 1 Quantity - 4:
21. Store 1 Quantity - 5:
22. Store 1 Quantity - 6:
23. Store 1 Price - 1:
24. Store 1 Price - 2:
25. Store 1 Price - 3:
26. Store 1 Price - 4:
27. Store 1 Price - 5:
28. Store 2 Quantity - 1:
29. Store 2 Quantity - 2:
30. Store 2 Quantity - 3:
31. Store 2 Quantity - 4:
32. Store 2 Quantity - 5:
33. Store 2 Quantity - 6:
34. Store 2 Price - 1:
35. Store 2 Price - 2:
36. Store 2 Price - 3:
37. Store 2 Price - 4:
38. Store 2 Price - 5:
39. Store 2 Price - 6:
40. y-axis:
41. x-axis:
42. Where I will purchase the item:
43. Why:
44. Store 1 Price - 6:
45. Store 1 - Equation:
46. Store 2 - Equation:
47. Grocery Item - 1:
48. Name:
49. Date:
50. Store 1 Quantity - 1:
51. Item: