SOLUTION: how can you tell if y=9x-2 is a function?

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Question 357189: how can you tell if y=9x-2 is a function?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how can you tell if y=9x-2 is a function?
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graph it and see if it passes the vertical line test.
If x = 0, y = -2, giving you the point (0,-2)
If x = 1, y = 7, giving you the point (1,7)
Plot the two points and draw a line thru them.
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graph%28400%2C300%2C-10%2C10%2C-10%2C10%2C9x-2%29
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Vertical line test.
If every vertical line intersects the graph only once
the equation is a function.
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Cheers,
Stan H.