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2. 1 gold medal and 3 bronze Self Practice 6.3a 3. First part of the wire = 24 cm
medals; 1. (a) x + y = 6 Second part of the wire = 24 cm
2 gold medals and 2 bronze 20x + 40y = 160 Third part of the wire = 52 cm
medals; y 4. Lai Yee: 45 stamps
3 gold medals and 1 bronze Khadijah: 15 stamps
medal. 6 x + y = 6
5 5. Devaki's father: 30 years old
Self Practice 6.2d 4
3 Devaki: 6 years old
1. Diagram (a) and Diagram (c). 2 20x + 40y = 160 6. Sarah: RM35
1
Mastery 6.2 0 1 2 3 4 5 6 7 8 x Hui Chin: RM15

1. (a) 30x – 20y = 8 (b) 2x + 2y = 12 Let’s Practise
(b) x + 2y = 130 x – y = 2 1. 16 sweets
(c) x = 2y y 2. 220 points
2. (a) (4, 3), (2, 5) 6 3. Ella = RM600
(b) (1, 7), (2, 12) 5 2x + 2y = 12 Zahida = RM960
or other valid answers 4 x – y = 2
3. (a) y 3 2 4. RM310 2
5. 187 cm
3 1 x 6. A cup of coffee: RM1.80
2 0 1 2 3 4 5 6
1 A piece of curry puff: RM0.80
0 x Self Practice 6.3b 7. 3 children
–1 1 2 3 4 5
–2 1. (a) x = 2, y = 7 8. Asnita: 25 years old
(b) x = 9, y = – 4 Reslynna: 19 years old
(b) y (c) x = 2, y = 0 9. Year 2013
8 (d) x = –26, y = 68 Population of trees = 25
7 10. 12.7s
6 Self Practice 6.3c 11. Pineapple: RM2
5 1. 500 booklets of RM30 coupon
4 and 300 booklets of RM50 Watermelon: RM1.50
3 12. P : RM287 500
2 coupon Q : RM108 000
1 x 2. p = 50 m, q = 25 m
–2–1 0 1 2 Mastery 6.3
Chapter 7 Linear Inequalities
(c) y 1. x – y = 5
4 2x + y = 7 Self Practice 7.1a
3 y 1. (a) ,
2 – is less than 0.
6
1 7 6
–6 –5 –4 –3 –2 –1 0 1 2 x 5 2x + y = 7 (b) , 1
1
4 is less than .
4. 1 shirt and 6 pairs of pants; 3 7 4
2 shirts and 4 pairs of pants; 2 1 (c) .
3 shirts and 2 pairs of pants. x 0.42 is greater than 0.072.
The maximum number: 3 shirts –1 0 1 2 3 4 5 (d) . 
5. 10x + 20y = 500 –2 4.5 is greater than 4.5.
–3
y –4 x – y = 5 (e) .
–5 10 cm is greater than 50 mm.
25
20 Unique solution. (f) ,
15 1 200 g is less than 1.6 kg.
10 2. (a) x = 2, y = 3
5 (b) m = 5, n = –2 Self Practice 7.1b
0 10 20 30 40 50 x (c) p = 9, q = 1 1. 12 is greater than y.
(d) f = 10 , g = 20 12 . y
3 3

314
Answers

14 Ans Math F1.indd 314 11/10/16 12:23 PM