Functions and Relations 1703

トピック:関数

Use the check boxes to explore each of the four different relations and decide if they are functions.

Select the correct answer.

Relation One is a function

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Relation Two is a function

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Both relation Three and Four are functions

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Consider again relation Two. Which of the following is true.

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A
The 'top half' (y>0) of the relation is a function but the bottom half is not because it is below the x-axis.
B
The right half (x>0) of the relation is a function but the left half is not because it involves too many negative numbers.
C
No 'part' of this relation can ever be a function.
D
Both the top half and the right half of the relation are functions
E
Bothe the top and the bottom half of the relation can be considered function.