larrissia
Determine whether the formula describes Y as a function of X: y=9x+1



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S0fw0N
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dw:1356561194081:dw

larrissia
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I don't understand?

S0fw0N
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if every (x) has 1 (y) then (y) is a function of (x)

S0fw0N
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now if every (x) has 2 (y) s then (y) is not a function of (x)
(x) is a function of (y)

S0fw0N
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dw:1356561453642:dw

S0fw0N
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dw:1356561580944:dw

S0fw0N
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did u get it @larrissia

seidi.yamauti
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S0fw0N is waiting for you to give the real answer. So he/she just explained how it works!

seidi.yamauti
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You need to see if the formula is injective.

seidi.yamauti
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(if you plot the function, there must be just one y for each x, but there can be two or more x for an y value)

dpaInc
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in plain english, for any ONE x value, will you have only ONE y value?

jefftheloveableguy
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Yes for example if at (2,4). The point (2,7) would not make it a function because it does not pass the vertical line test.