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Ok so, lets make an example. Is (5, 2) (5, 4) a function?
@milo123
Well anyway you're right, its A. the X value never repeats
Functions are "one to one." That means that for each input value, there is exactly one output value. Is (5, 2) (5, 4) a function? No, because for the input value 5, there are two output values (2 and 4). No. Check out possible answer A in the same manner.
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