Relation Representing a Function

[mathdad]

Does each relation represents a function?

1. {2, 4}, {5, 7}, {6, 4}, {3, 4}, {4, 2}

I see that no x-value repeats. This is a function. You say?

2. {blue, red}, {red, yellow}, {orange, pink}, {blue, white}

This is not a function because the word blue is repeated.

You say?

 

[Harry_the_cat]

Does each relation represents a function?

1. {2, 4}, {5, 7}, {6, 4}, {3, 4}, {4, 2}

I see that no x-value repeats. This is a function. You say?

2. {blue, red}, {red, yellow}, {orange, pink}, {blue, white}

This is not a function because the word blue is repeated.

You say?

1. correct
2. not so much that the word "blue" is repeated, but that the "blue" is followed by two different colours. If the last pair was again {blue, red}, then it would be a function.

 

[mathdad]

1. correct
2. not so much that the word "blue" is repeated, but that the "blue" is followed by two different colours. If the last pair was again {blue, red}, then it would be a function.

I get it now. Thanks.