# math

#8 or 9.

Determine if the set of ordered pairs represents a function. Explain why or why not. (2 points)
{(-4, 4), (-2, 2), (0, 0), (-2, -2)}

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1. If a relation has two or more points in which the same x yields different values of y, then it is NOT a function.
or
To be a function you cannot have two or more points lying on the same vertical line,

visualize where (-2,2) and (-2, -2) would be on a grid, and reach a conclusion.

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Reiny
2. @ reiny, is that the explanation? and when you put yields do you mean fields?

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3. is it a function?

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4. yes, I meant yields, like produce
Some text books show a diagram of a "function machine" where you have
an input , the x, and an output, the y.
So an input of some x value yields or produces an output, the y.

Looking back at my explanation, it seems obvious what conclusion I had drawn.

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Reiny
5. (-2, 2), (-2, -2).
The 1st point says : when X = -2, Y = positive 2.
The 2nd point says: when X = -2, Y = negative 2.
Well, we cannot have it both ways.
Y can be +2 or -2, but not both.
Therefore, it is NOT a function.

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6. what would it be if the ordered pair was {(-4,4),(-2,2),(0,0),(-3,-2)}? I think it might be a function but im not sure.

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