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Copyright © by Holt, Rinehart and Winston. 23 Holt MathematicsAll rights reserved.
Name Date Class
LESSON
Graph each point below in the order given. Connect the pointsas you graph them to see a creature that lives most of its life50 feet below sea level, or �50 feet.
START: (0, 20), (1, 19), (3, 18), (5, 15), (6, 15), (6, 12), (10, 8), (12, 8), (11, 6), (9, 6), (9, 7), (3, 11), (0, 11), (�2, 12), (3, 4), (2, 1),(3, �4), (�1, �13), (0, �17), (4, �18), (7, �17), (7, �16), (5, �16),(6, �14), (8, �15),(9, �18), (6, �20), (3, �20), (�3, �18),(�4, �13), (�2, �4), (�3, �1), (�4, �2), (�6, 2), (�5, 5), (�10, 12), (�6, 18), (0, 20) STOP!
Check students’ graphs. The picture should be a seahorse.
x
OOOO 88888 1221 1661
8888
166661
200002
4444
44444�88888��1221��1661�4444
�8888
��122221
��166661
y
OO
��200002
OO
ChallengePlot and See11-3
MSM07G6_RESBK_Ch11_019-026.pe 2/10/06 11:14 AM Page 23
Copyright © by Holt, Rinehart and Winston. 89 Holt Mathematics
Copyright © by Holt, Rinehart and Winston. 23 Holt MathematicsAll rights reserved.
LESSON
Graph each point below in the order given. Connect the pointsas you graph them to see a creature that lives most of its life50 feet below sea level, or �50 feet.
START: (0, 20), (1, 19), (3, 18), (5, 15), (6, 15), (6, 12), (10, 8), (12, 8), (11, 6), (9, 6), (9, 7), (3, 11), (0, 11), (�2, 12), (3, 4), (2, 1),(3, �4), (�1, �13), (0, �17), (4, �18), (7, �17), (7, �16), (5, �16),(6, �14), (8, �15),(9, �18), (6, �20), (3, �20), (�3, �18),(�4, �13), (�2, �4), (�3, �1), (�4, �2), (�6, 2), (�5, 5), (�10, 12), (�6, 18), (0, 20) STOP!
Check students’ graphs. The picture should be a seahorse.
xO 8 12 16
8
16
20
4
4�8�12�16�4
�8
�12
�16
y
�20
ChallengePlot and See11-3
Copyright © by Holt, Rinehart and Winston. 24 Holt MathematicsAll rights reserved.
LESSON
Use the coordinate plane on the map of Texas below to answereach question.
Austin
DallasFortWorth
Texarkana
El Paso
GalvestonHouston
Big Bend National Park
Lubbok
Amarillo
Midland
Wichita Falls
SanAntonio
LaredoCorpus Christi
Beaumont
6
5
4
3
2
1
0–1–2–3–4–5–6 1 2 3 4 5 6–1
–2
–3
–4
–5
–6
Problem SolvingThe Coordinate Plane11-3
1. Which location in Texas is closest tothe ordered pair (5, �2)?
Galveston3. Which location in Texas is closest to
the ordered pair (�6, 1)?
El Paso5. Which three locations in Texas all
have positive y-coordinates andnearly the same x-coordinate?
Midland, Lubbock, and Amarillo
2. What ordered pair best describes thelocation of Dallas, Texas?
(3, 2)4. Which location in Texas is located in
Quadrant III of this coordinate plane?
Big Bend National Park6. Which cities on this map of Texas
have locations with y-coordinatesless than �3?
Laredo and Corpus Christi
Copyright © by Holt, Rinehart and Winston. 25 Holt MathematicsAll rights reserved.
A coordinate plane is formed when two number lines intersect atright angles.
Answer the following questions.
1. What is the horizontal number line of the coordinate planecalled?
the x-axis2. What is the vertical number line of the coordinate plane called?
the y-axis3. Where do the number lines intersect?
the origin, or point (0, 0)Points are located on the coordinate plane with ordered pairs, suchas (3, 4). The numbers in an ordered pair are called coordinates.Their order determines how to locate a point.
The first number in an ordered pair tells how far to move to the rightor left on the x-axis.
The second number in an ordered pair tells how far to move up ordown on the y-axis.
Answer the following questions.
4. What does an ordered pair tell you?
It tells the location of a point on the coordinate plane. 5. What are the two numbers in an ordered pair called?
coordinates
Reading StrategiesFocus on Vocabulary 11-3
LESSON
x-axis
O 4
4
2
2�2
�2
�4
�4
y-axis
Quadrant IQuadrant II
Quadrant IVQuadrant III
origin
Copyright © by Holt, Rinehart and Winston. 26 Holt MathematicsAll rights reserved.
Puzzles, Twisters & Teasers Face It!11-3
LESSON
Follow the directions below to create your own coordinatedrawing. Then decide if you have Happy Harry or Sad Selma!
1. Plot the following points: (3, 3), (3, 5), (5, 3), (5, 5). Shade in the square defined by those points. This square is in whichquadrant?
Quadrant I2. Plot these points: (�3, 3), (�3, 5), (�5, 3), (�5, 5). Shade in the
square. This square is in which quadrant?
Quadrant II3. Plot these points: (2, �4), (2, �5), (�2, �4), (�2, �5).
This rectangle is in two quadrants; what are they?
Quadrants III and IV4. Plot the following two sets of points and shade in the figures:
(2, �4), (3, �4), (2, �3), (3, �3)(�2, �4), (�3, �4), (�2, �3), (�3, �3)
5. Shade in a small area around the origin.
6. Do you have Happy Harry or Sad Selma?
Happy Harry
x
y
O
2
2
4
4
6
6
8
8�8 �6 �4 �2
�2
�4
�6
�8
MSM07G6_RESBK_Ch11_084-104.pe 2/10/06 11:43 AM Page 89
