PreCalc

State the domain and range for the following relation. Then determine whether the relation represents a function. {(6,2), (-5,2) (9,7), (6,12)}

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  1. Well... it DOES NOT pass the straight line test. To be a function there can only be ONE y value for each x value. But clearly y is both 2 and 12 when x = 6.
    But it is only 4 dots...
    So.. .the domain starts at -5 and only goes to 9, that is
    domain = {x| x = -5,6, 9}
    Now you find the range

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