Answers to Practice Book exercises

13 Graphs

F Exercise 13.1 Plotting coordinates

1 D(−3, 4), E(0, 3), F(4, −1), G(−2, −3)
2 a P(−4, −2), Q(6, −2) b (1, −2)

3 a S
y b (0, 1)
4
3
2
1

0 x
–4 –3 –2 –1 1 2 3 4
–1
–2
R
–3
–4

4 a y b D(−2, 4)
4
D
3
A
2
1
C
0 x
–5 –4 –3 –2 –1 1 2 3 4 5
–1
–2
B
–3
E
–4

5 a (−3, −2) b (−1, 0)

y
6 a b CA and CB are both 5 units long.
7
A
6
5
4
3
2
1
C B
0 x
–4 –3 –2 –1 1 2 3
–1

7 a (3, −2) b (−1, 1) c (0, 3) d (2, 1)

Copyright Cambridge University Press 2012 Cambridge Checkpoint Mathematics 7 1

 Unit 13 Answers to Practice Book exercises

8 a y b (2, 3)
4
B
3
2
1

–2 –1 0 x
–6 –5 –4 –3 1 2 3
–1
M
–2
–3
–4
–5
A
–6

F Exercise 13.2 Lines parallel to the axes

1 a y=2 b x = −3 c y = −4 d x=2
2 a F, M and L b F, G and H
3 a x = 4 and y = 7 b x = −3 and y = −6 c x = 0 and y = 9

4 a y b (−4, 2) and (−4, −5)

3
2
1
x
–5 –4 –3 –2 –1 0 1 2 3
–1
–2
–3
–4
–5
–6

5 a y = −5 b x=3 c y=0
6 a y
6
5
4
3
2
1

0 x
–6 –5 –4 –3 –2 –1–1 1 2
–2

b (−2, 3), (−2, 5), (−6, 3) and (−6, 5) c x = −4 and y = 4

7 y = −6

2 Cambridge Checkpoint Mathematics 7 Copyright Cambridge University Press 2012

 Answers to Practice Book exercises Unit 13

F Exercise 13.3 Other straight lines

1 a The missing values are 0, 2, 3 and 6. b y
6
5
4
3
2
1
x
–4 –3 –2 –1 0 1 2 3 4
–1
–2

2 a The missing values are −2, 0, 6 and 8. b y

8
7
6
5
4
3
2
1
0 x
–2 –1–1 1 2 3 4
–2
–3
–4

3 a The missing values are −2, 0, 6 and 8. b y

10
9
8
7
6
5
4
3
2
1

0 x
–4 –3 –2 –1 1 2
–1
–2
–3
–4

c (−2, 0) d (0, 4)
4 a The missing values are 9, 7, 4 and 1. b y
8
c (6, 0)
7
6
5
4
3
2
1

0 x
–3 –2 –1 1 2 3 4 5 6 7
–1

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 Unit 13 Answers to Practice Book exercises

5 a The missing values are 11, 1 and −3. b y

12
11
10
9
8
7
6
5
4
3
2
1
x
–2 –1 0 1 2 3 4
–1
–2
–3
–4

6 a The missing values are −1, 1, 3, 7 and 11. b y

12
11
10
9
8
7
6
5
4
3
2
1

0 x
–2 –1 1 2 3 4
–1
–2

7 A is y = 2 − x; B is y = 2 + x; C is y = 2x
y
8 a, b c (−2, 2)
6
5
4
3
2
1
x
–5 –4 –3 –2 –1 0 1 2
–1

4 Cambridge Checkpoint Mathematics 7 Copyright Cambridge University Press 2012