4條題目 maths

2009-03-22 2:47 am

回答 (1)

2009-03-22 3:52 am
✔ 最佳答案
1.(a)
y=kx, where k is a non-zero constant.
When x=5,y=30.
30=5k
k=6
(b)
y=6x
When x=7
y=6(7)
=42


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