Name Date Class LESSON Practice A 9-3 The Coordinate Plane Use the coordinate plane to answer questions 1 and 2. Circle the letter of the correct answer. 1. Which point is located in Quadrant I? y A point Q 4 B point P X (2, 3) C point X 2 (D point Y Y (؊2, 1 x Which point is located in Quadrant IV? ؊4 ؊2 O 2 4 .2 F point X ؊2 (P (1, ؊2 (G point Y Q (؊3, ؊2 H point Q ؊4 J point P Use the coordinate plane to answer questions 3 and 4. Circle the letter of the correct answer. 3. What are the coordinates of point A? y A (1, 3) B 4 B (3, 1) C (3, ؊1) 2 (D (؊1, 3 C x What are the coordinates of point D? ؊4 ؊2 O 2 4 .4 A F (1, ؊1) ؊2 D G (1, 1) H (؊1, 1) ؊4 (J (؊1, ؊1 5. If a point is located at the origin, what 6. What is the difference between the are that point’s coordinates? x-axis and the y-axis? Copyright © by Holt, Rinehart and Winston. All rights reserved. 27 Holt Middle School Math Course 1 LESSON Problem Solving LESSON Puzzles, Twisters & Teasers 9-2 Comparing and Ordering Integers 9-2 To Tell the Truth Use the table below to answer each question. For each box, decide whether the statement is true or false. If it is false, black out the box. Continental Elevation Facts Highest Elevation (ft) Lowest Elevation (ft) The remaining boxes will give you the visual effect of a number. Continent Point above sea level Point below sea level What is the number? 4 Africa Mount Kilimanjaro 19,340 Lake Assal ؊512 (Clue: The name of the number has the same number of letters as its value.) Bentley Subglacial Antarctica Vinson Massif 16,066 Trench ؊8,327 Asia Mount Everest 29,035 Dead Sea ؊1,349 2 Ͼ ؊7 ؊1 Ͻ ؊6 ؊7 Ͼ 2 Australia Mount Kosciusko 7,310 Lake Eyre ؊52 WJM Europe Mount Elbrus 18,510 Caspian Sea ؊92 ؊6 Ͻ ؊1Least to greatest0 Ͼ ؊1.5 North America Mount McKinley 20,320 Death Valley ؊282 ؊4, 8, ؊27 South America Mount Aconcagua 22,834 Valdes Peninsula ؊131 URS Η؊4Η Least to greatest ؍ Η2Η Ͻ Η؊3Η 4 What is the highest point on Earth? 2. What is the lowest point on Earth? ؊27, ؊4, 8 .1 What is its elevation? What is its elevation? TAL ؊3 Ͻ 2 0 Ͻ ؊1.5 ؊4 Ͼ ؊3 Mount Everest; 29,035 feet Bentley Subglacial Trench; Η Η Η Η Η Η Η Η above sea level 8,327 feet below sea level EK I 3. Which point on Earth is higher, 4. Which point on Earth is lower, the Mount Elbrus or Mount Kilimanjaro? Caspian Sea or Lake Eyre? Now see if you can answer the following riddle. To do so, take the letters from the boxes that you did not cross out and Mount Kilimanjaro Caspian Sea rearrange them. The remaining letters are W U T A S L I Circle the letter of the correct answer. What kind of suit do lawyers wear? 5. Which continent has a higher 6. Which continent has a lower L A W S U I T elevation than North America? elevation than Africa? A Antarctica F Australia ࠗB South America G Europe C Europe ࠗH Asia D Australia J South America 7. Write the continents in order by their highest points, from highest elevation to lowest elevation. Asia, South America, North America, Africa, Europe, Antarctica, Australia Copyright © by Holt, Rinehart and Winston. Copyright © by Holt, Rinehart and Winston. All rights reserved. 23 Holt Middle School Math Course 1 All rights reserved. 24 Holt Middle School Math Course 1 LESSON Exploration Recording Sheet LESSON Practice A 9-3 The Coordinate Plane 9-3 The Coordinate Plane On the coordinate plane shown, the y-axis Use the coordinate plane to answer questions 1 and 2. color of the first number in each Circle the letter of the correct answer. ordered pair matches the color of II(؊3, 4) (3, 4) I 1. Which point is located in Quadrant I? y the x-axis, and the color of the A point Q second number in each ordered 3 4 (؊2, 3) (2, 3) pair matches the color of the B point P X (2, 3) y-axis. ࠗC point X 2 (D point Y Y (؊2, 1 x-axis x ؊2 2 Which point is located in Quadrant IV? ؊4 ؊2 O 2 4 .2 F point X ؊2 (؊2, ؊3)(2, ؊3) P (1, ؊2) (؊3 G point Y Q (؊3, ؊2 H point Q ؊4 III(؊3, ؊4) (3, ؊4) IV ࠗJ point P 1. The four points graphed are labeled with their ordered pairs. Use the coordinate plane to answer questions 3 and 4. How are these four ordered pairs alike? How are they different? Circle the letter of the correct answer. 3. What are the coordinates of point A? Possible answer: The first numbers in each pair have the same absolute y A (1, 3) B 4 values. Points on the right of the y-axis have a positive x-coordinate; B (3, 1) points on the left of the y-axis have a negative x-coordinate; points above ࠗC (3, ؊1) 2 (D (؊1, 3 the x-axis have a positive y-coordinate; points below the x-axis have a C x What are the coordinates of point D? ؊4 ؊2 O 2 4 .4 negative y-coordinate. D A ࠗF (1, ؊1) ؊2 (Plot the points (3, 4), (؊3, 4), (؊3, ؊4), and (3, ؊4) on the G (1, 1 .2 same coordinate plane. See above. H (؊1, 1) ؊4 (Think and Discuss J (؊1, ؊1 3. Describe what each number in an ordered pair tells you. 5. If a point is located at the origin, what 6. What is the difference between the are that point’s coordinates? Possible answer: The first tells how many units to move left or right, the x-axis and the y-axis? second tells how many units to move up or down. (0, 0) The x-axis runs horizontally; 4. Explain how a negative sign indicates which direction to move the y-axis runs vertically. when plotting points on a coordinate plane. Possible answer: A negative x-coordinate puts the point left of the y-axis; a negative y-coordinate puts the point below the x-axis. Copyright © by Holt, Rinehart and Winston. Copyright © by Holt, Rinehart and Winston. All rights reserved. 26 Holt Middle School Math Course 1 All rights reserved. 27 Holt Middle School Math Course 1 Copyright © by Holt, Rinehart and Winston. All rights reserved. 95 Holt Middle School Math Course 1.