Question 87674
If x and y are integers, find the domain of        { (x,y) : |y|= x and x_<4} graph the relation. Is it a function?
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If x=|y|, x is always greater than or equal to zero.
If x <= 4 AND x=|y|, then 0<=x<=4 is the Domain.
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For those values of x |y| will have only one value for each x value;
so the relation is a function.
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Cheers,
Stan H.