If y − 4 = 2x, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs?

{(2, 1), (4, 2), (6, 3)}

{(1, 2), (2, 4), (3, 6)}

{(4, 0), (6, 1), (8, 2)}

{(0, 4), (1, 6), (2, 8)}

The first thing we want to do is to make the equation a function, so we put y by itself on one side,

Add 4 to both sides

y = 2x + 4   <<< This is the equation that we will use

So if we input these numbers in,

The answer seems to be D. Where if x = 0 then y = 4 and so on

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