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Which of these is a function?

y = 2x - 64
{(3, 6), (5, 8), (3, -6), (5, -8)}
x = y^2
{(1, 3), (2, 4), (1, 4), (2, 3)}

My answer y = 2x - 64
is this correct

1 answer

It is correct, assuming y is the function in the first and third choices.
Can you explain why the others are not functions?

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