德望學校 – S2數學 2B Chapter 7 Linear Equations in 2 Unknowns – CQ (13-18)

試卷答案:

1. a i) x | -2 | 0 | 2
          y |  6 | 5  | 4
     ii) x | -2 | 0 | 2
          y |  0 | 3 | 6
   b)
   
2. 7.5 L of buffalo mulk and 12.5 L of skimmed milk are required.
3. 20
4. 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
5. 85
6. The speed of car A is 82.5 km/h and speed of car B is 67.5 km/h.
7. The walking speed is 80 m/min and the running speed is 200 m/min.
8. 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
9. The numbers of students in S.2G and S.2G are 40 and 30 respecftively.
10. x =3, y =3
11. x = 5.5, y = -5
12. y = 4, z = -3
13. The cost of an apple is $5 and the cost of a pineapple is $25.
14. a) x = -1, y = 3
    b) a = -1 , b = 1/3
15. x = -2, y = 4

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