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Mathematics Form 3 Chapter 9 Straight Lines

HOTS Challenge PT3 Model Paper

Types A B
Packaging
Section A 5. 4.3 × 10 + 0.00174
–5
Packet (x) 10 15 = 4.3 × 10 + 1.74 × 10 –3
–5
Boxes (y) 8 20 1. = (0.043 + 1.74) × 10 –3
–3
740 1 350 = 1.783 × 10
Answer: C
10x + 8y = 740 ....................(1)
15x + 20y =1 350 ................(2)
1 + 2 2 + 2 –3 3

17
10

From (1) 6.   =  
10x + 8y = 740 17 10
x = (740 – 8y) ÷ 10 3 1
17
x = 74 – 0.8y =    2
10
Substitute (3) into (2) 3
17
15(74 – 0.8y) + 20y = 1 350 =   2
1 110 – 12y + 20y = 1 350 10
8y = 240 Answer: C
y = 30 3 + 2 4 + 2
x = 74 – 0.8 × 30 7. x + 90° + 0.5x + 69° + 2x + 68° = 360°
x = 50 = 5 3.5x + 227° = 360°
∴ 5n + 2, n = 1, 2, 3, 4, … 3.5x = 133°
x = 38°
Answer: A
Answer: A
2.
8 8, 16, 64 8. Answer: B
1, 2, 8
Answer: B x + x y + y
9. Midpoint =  1 2 2 , 1 2 2 

3. Scale S =  –6 + (–2) , –9 + 3 
= length of drawing : length of object 2 2
= 0.16 cm : 5 m = (–4, –3)
= 0.16 : 500 Answer: A
= 1 : 3 125

Answer: C 10. Coordinates of image
= (–1 + 7, –5 + –5)
= (6, –10)
4. Answer: D
Answer: C

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BOOKLET ANS MATH F3.indd 29 03/01/2020 10:21 AM