Maths a Answers
Answers
Chapter 1 c i No x-intercept, y = 4 iii y Pre-test
1 a 2x + 1
1
3
c x+ x= x
2
2 f 3x − 7
b 5(x − 1)
1
(x + 4)
3
-5ab
-21x
-4x + 4
3
ii 0
y=4
d 2x − 3
e
a a a a 7x
8y
3x + 3
4m
b b b b 6a
7
6
b
7
12
9 a 3 b -2 c 1
10 a y = 2x + 1 b y = -x + 5
c
4
7
d
19
72
Exercise 1A
f
21
20
2
3
4
5
4 e 7
c c c c -5x 2
15a 2
-10x + 2x 2 a (0, 4)
d
g
c 10 ii 1
4
5
6
7
y
y=x+4
(0, 4)
(-4, 0)
x
0
b i x = 3, y = -2
ii
iii
2x
3
1 C
2 D
3 a 7
49
3
h
4
9
7a4
b7
8 a i x = -4, y = 4 iii x
0
2
3
1 e 2 a Yes a 9 a 10a e 4ab i -3m2n m 3a + 7b q 5st − s 2t a 12ab e 30ht i 8a 2b 4
b 1 f b b b f j n r b f j c -4
1 g -
5
Yes c -8 c 15d c 9t g -0.7a 2b k
8jk − 7j o
3x 3y 4 + 2xy 2
25ab
c
30bl
g
24p3q
k
(3, 0)
(0, -2)
0
2x
3
-6ad
12s 2t
-18h5i 5
d -10hm h -21b 2d 5 l 63m 2pr
m x
n 3ab
a o- 3
p -
ab
4
q 2b
r -3x
s-
y 2
t-
a
2
y y= d -9
2
7
h 7
3
No
-8
d -9
0
d 5xy
9b
h -st 2
2gh + 5 l 12xy − 3y ab 2 + 10a 2b p 2mn − m 2n
−2
x
8 a 5x + 5 d -20 − 5b g 6m + 18 j 2x 2 + 10x m 15y 2 + 3yz − 24y
b 2x + 8 c 3x − 15 e -2y + 6 f -7a − 7c h 4m − 12n + 20 i -2p + 6q + 4 k 6a 2 − 24a l -12x 2 + 16xy n 36g − 18g 2 − 45gh
676
ISBN 978-0-521-17866-2
© David Greenwood, Sara Woolley, Jenny Goodman, Jennifer Vaughan, GT Installations, Georgia Sotiriou, Voula Sotiriou 2011 Cambridge University Press
Photocopying is restricted under law and this material must not be transferred to another party.
6 a
x −1 2x
e 5
1
2
7 a 3
x +4 5x
5a
f 2
b
Chapter 1 c i No x-intercept, y = 4 iii y Pre-test
1 a 2x + 1
1
3
c x+ x= x
2
2 f 3x − 7
b 5(x − 1)
1
(x + 4)
3
-5ab
-21x
-4x + 4
3
ii 0
y=4
d 2x − 3
e
a a a a 7x
8y
3x + 3
4m
b b b b 6a
7
6
b
7
12
9 a 3 b -2 c 1
10 a y = 2x + 1 b y = -x + 5
c
4
7
d
19
72
Exercise 1A
f
21
20
2
3
4
5
4 e 7
c c c c -5x 2
15a 2
-10x + 2x 2 a (0, 4)
d
g
c 10 ii 1
4
5
6
7
y
y=x+4
(0, 4)
(-4, 0)
x
0
b i x = 3, y = -2
ii
iii
2x
3
1 C
2 D
3 a 7
49
3
h
4
9
7a4
b7
8 a i x = -4, y = 4 iii x
0
2
3
1 e 2 a Yes a 9 a 10a e 4ab i -3m2n m 3a + 7b q 5st − s 2t a 12ab e 30ht i 8a 2b 4
b 1 f b b b f j n r b f j c -4
1 g -
5
Yes c -8 c 15d c 9t g -0.7a 2b k
8jk − 7j o
3x 3y 4 + 2xy 2
25ab
c
30bl
g
24p3q
k
(3, 0)
(0, -2)
0
2x
3
-6ad
12s 2t
-18h5i 5
d -10hm h -21b 2d 5 l 63m 2pr
m x
n 3ab
a o- 3
p -
ab
4
q 2b
r -3x
s-
y 2
t-
a
2
y y= d -9
2
7
h 7
3
No
-8
d -9
0
d 5xy
9b
h -st 2
2gh + 5 l 12xy − 3y ab 2 + 10a 2b p 2mn − m 2n
−2
x
8 a 5x + 5 d -20 − 5b g 6m + 18 j 2x 2 + 10x m 15y 2 + 3yz − 24y
b 2x + 8 c 3x − 15 e -2y + 6 f -7a − 7c h 4m − 12n + 20 i -2p + 6q + 4 k 6a 2 − 24a l -12x 2 + 16xy n 36g − 18g 2 − 45gh
676
ISBN 978-0-521-17866-2
© David Greenwood, Sara Woolley, Jenny Goodman, Jennifer Vaughan, GT Installations, Georgia Sotiriou, Voula Sotiriou 2011 Cambridge University Press
Photocopying is restricted under law and this material must not be transferred to another party.
6 a
x −1 2x
e 5
1
2
7 a 3
x +4 5x
5a
f 2
b