year 8 maths

636
c
O
y
5
x
i
−5 O y
x
−10
−15
d
e
y
9
−3 O y
−2 O −4
x
x
6 a 4 square units b 1.5 square units
c 12.5 square units
7 a y = x + 4 b y = 1 2 x − 1
c y = 3x + 6 d y = −5x + 25
8 a 20 cm b 10 seconds
9 a 200 cents b 200 seconds
10 horizontal lines; e.g. y = 2, y = −5
d 8 square units
11 a negative b positive c negative d positive
12 x = − b m
13 a 6 b 4 c −2
d 3 e − 2 3
g −2 h 3 2
3
f
2
1
i
3
Exercise 7G
f
y
8
1
x −2 −1 0 1 2
y −5 −3 −1 1 3
y
O
2
x
5
4
3
g
y
2
1
3
−3
−2
−1
O
−1
1
2 3
x
O
3
x
−2
−3
−4
h
y
−5
−5
O
−5
x
2 i x = 5 ii x = −1
3 a (2, 4) b (3.2, 6, 4)
c (−2.3, −4, 6) d (3.5, 7)
e (−7, −14) f (1000, 2000)
g (31.42, 62.84)
h (−24.301, −48.602)
any number
i
, any number
( 2
)
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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