Mathematics, 13.11.2020 06:50 sophiaa23

Which set of ordered pairs represents y as a function of x? {(2,-1), (4, -2), (6, -3), (8, -4)}
{(0, 0), (1, 1), (1, 0), (2, 0)}
{(3, 3), (3, 4), (4, 3), (4, 4)}
{(1, -5), (1, 5), (2, -10), (2, -15)}

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Which set of ordered pairs represents y as a function of x? {(2,-1), (4, -2), (6, -3), (8, -4)}