德望學校 – S2數學 2B Chapter 7 Linear Equations in 2 Unknowns – CQ (11-16)

試卷答案:

1. a i) x | -1 | 0 | 1
          y | -1 | 2 | 5
     ii) x | 0 | 1 | 2
          y | 7 | 5 | 3
   or any correct pairs of x-y values
   b) 
   
   c) x = 1, y = 5
2. a) x = -1, y = 5
   b) r = 0.05, s = -0.01
3. 102
4. a i) x | -2 |  0  | 1
          y | 4   | -2 | -5
     ii) x | -2 | 0 | 2
          y | -1 |  3 | 7
   b)
   
   c) x = -1, y= 1
5. A pen costs $1.25 and a pencil costs $0.5.
6. x = 5, y = 4.5
7. a) x |   -3  |  2 |  4  |  8
        y | -5.5 | 7 |  12 | 22
   b) a = -0.8, b = 2
8. a i) x | -2 | 0 | 2
          y |  6 | 5  | 4
     ii) x | -2 | 0 | 2
          y |  0 | 3 | 6
   b)
   
9. 7.5 L of buffalo mulk and 12.5 L of skimmed milk are required.
10. 20
11. a i) x | -2 | -1 | 0
           y |   1 | -1 | -3
      ii) x | -1 | 2 | 5
           y |  3 | 1 | -1
    
    b) x = -4, y = 5
    c) a = -11
12. 85
13. The speed of car A is 82.5 km/h and speed of car B is 67.5 km/h.
14. The walking speed is 80 m/min and the running speed is 200 m/min.
15. a i) x | -2 |  0 |  4
           y | -4 | -3 | -1
      ii) x | 2 | 3 | 4
           y | 1 | 3 | 5
    b)
    
    c) x = 0, y = -3
16. The numbers of students in S.2G and S.2G are 40 and 30 respecftively.
17. x =3, y =3

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