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You did these with your group. Now do them on your own — the model above is yours to copy.

1. 1

   Same stepsFinish what the group started. Use the model above, step for step.

   Try it together — then prove it: A recipe uses 1 cup of sugar for every 3 cups of flour. For 1 cup of sugar, the ordered pair is (1, 3): right 1, up 3. For 2 cups of sugar, what is the pair? It is (2, 6): right 2, up 6. Now prove it: say why that move had to work at all — not just that it did.

   Show your work
2. 2

   Warm restartA ratio table for 2:5 starts with 2:5, 4:10. What is the third row?

   1. A6:12
   2. B6:15
   3. C8:15
   4. D5:10

   How do you know?
3. 3

   Warm restartWhich row does NOT belong in a ratio table for 4:5?

   1. A8:10
   2. B12:15
   3. C6:10
   4. D16:20

   How do you know?
4. 4

   Warm restartA ratio table shows 3:7, 6:14, and 9:21. What is the next row?

   1. A10:24
   2. B12:24
   3. C12:28
   4. D15:28

   How do you know?

You answered these out loud. Now write them.

Answer, then say how you know — the reason is the part that counts.

1. 5

   Think it throughThe graph shows 1 taco uses 2 oz of salsa. How much salsa for 15 tacos?

   1. A30 oz
   2. B17 oz
   3. C7.5 oz
   4. D20 oz

   Why is that the answer?
2. 6

   Think it throughWhy do the points form a straight line through (0, 0)?

   1. ABecause the quantities are proportional — the same ratio holds for every pair
   2. BBecause the owner sold the same number of tacos every day
   3. CBecause all graphs of data are straight
   4. DBecause salsa is measured in ounces

   How do you know? Give a second reason as well.
3. 7

   Think it throughWhich point would NOT be on this line?

   1. A(4, 8)
   2. B(10, 20)
   3. C(6, 12)
   4. D(5, 12)

   Explain your thinking. What would have to change for a different choice to be right?
4. 8

   Back to the modelWhat pattern do the plotted points make? How does the graph show the ratio of 1 sundae to 2 ounces of sauce?

Use the words

Fill each blank with a word from the bank.

• Each row of a ratio table becomes one ___ ___ on the coordinate plane.
• The flat grid formed by a horizontal and a vertical number line is the ___.
• A set of two numbers (x, y) that names a point is an ___.
• When graphed points form a straight line, they show a ___.

Explain the thinking

1. 9

   Find the mistakeAnother student made this exact mistake in this lesson. Explain why it is wrong, then write what they should have done.

   The mistake: A common mistake in Graph Ratio Tables is writing the ordered pair in the wrong order — putting the second table value first instead of matching (x, y) to the table's column order.
2. 10

   Say moreAfter plotting (1,2), (2,4), (3,6)... what pattern do you notice, and how does it show the chocolate-sauce ratio?
3. 11

   Write your ownWrite your own problem about this situation, then solve it and show the answer. The situation: Chef Reyes keeps a table for sundae sauce: 1 sundae takes 2 ounces of chocolate sauce, 2 sundaes take 4 ounces, and 3 sundaes take 6 ounces. She starts plotting the (sundaes, ounces) pairs on a coordinate grid.

   Show your work

Last check

These two come from Lesson 3.3. If they are shaky, that is the lesson to revisit — not this one.

1. 12

   Show what you knowExplain your thinking — A ratio table shows cups of rice to cups of water: (1, 2), (2, 4), (3, 6). If you plot these points, the line passes through which point?

   1. A(5, 10)
   2. B(4, 6)
   3. C(5, 8)
   4. D(6, 10)

   Explain your choice.
2. 13

   From Lesson 3.3Explain your thinking — A salad dressing recipe uses 2 tablespoons of oil for every 5 tablespoons of vinegar. How many tablespoons of oil are needed for 20 tablespoons of vinegar?

   1. A8
   2. B10
   3. C7
   4. D12

   How do you know?
3. 14

   From Lesson 3.3Which pair is NOT equivalent to 3:2?

   1. A9:6
   2. B6:4
   3. C30:20
   4. D5:4

   How do you know?

Be honest — this tells your teacher what to do next