How do you know if $y = 2 x + 7$ $y=2x+7$ is a function?

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Answer 1 · 2018-05-29T16:13:21

Yes, it is a function.

It is a function because there is one unique $y$ $y$ (also know as $f (x)$ $f(x)$ ) output for each $x$ $x$ input. That equation is a line:

graph{2x+7 [-10.5, 9.5, -0.84, 9.16]}

How do you know if y=2x+7y=2x+7y=2x+7 is a function?