It is given that y=x+5.
Is it true that y∝x? Explain your answer.
I think that when x increase, y increase, so y∝x. But the answer is no.
Can anyone explain to me? Thank you~
F.5 maths Variations
2014-10-02 9:03 pm
回答 (2)
2014-10-03 2:40 am
✔ 最佳答案
Incase of y ∝ x, y = kx where k is a non-zero constant.That means when x is doubled, y will also be doubled.
y = x + 5
When x = 1: y = 6
When x = 2: y = 7
When x is doubled, y is not doubled.
Hence, y is not proportional to x.
參考: 土扁
2014-10-05 11:17 am
y ∝ x means y = kx where k is a real number and k ≠ 0.
For y = x+5,
y = 1(x+5)
it can mean y ∝ (x+5) , where k=1.
∴Not true.
For y = x+5,
y = 1(x+5)
it can mean y ∝ (x+5) , where k=1.
∴Not true.
收錄日期: 2021-04-15 16:47:19
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