EmmaH
True or False? Y varies directly with x and y = 9 when x = 3. When y = 27, the value of x is 9. someone PLEASE explain...:(



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AriPotta
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"y varies directly with x" is y = kx. we have to find out what k is. so we substitute 9 for y and 3 for x. 9 = 3k. can you tell me what k equals?

EmmaH
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ok one sec..

EmmaH
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3?

EmmaH
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oh so its false?

AriPotta
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yep. so now we can substitute 3 for k and 27 for y to see if x equals 9.
27 = 3x

AriPotta
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does x = 9?

EmmaH
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no x=3 it says so in the prob

AriPotta
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no, that says when x = 3, y = 9. y and x can be any number. k is the only variable that is constant

EmmaH
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ok sso its false though?

EmmaH
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*so

AriPotta
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why do you think it's false? are you just guessing? :/

AriPotta
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or did you do the math

EmmaH
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i did the math 9=3k so 9/3=3k/3 k=3 right o9r am i totaolly off?

AriPotta
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yea, k = 3, but we're trying to find out what x equals when y = 27

EmmaH
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x=9

AriPotta
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yes! which is not 9. so it's false. good job :)

elisichi
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EmmaH, k=3. So, now you substitute it in to check what x is when y=27
27=(3)x
x=9
Therefore, it is false.

EmmaH
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yay :) =D :D =)

elisichi
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Sorry I just realised I came in a little too late

EmmaH
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thanks guys...wait are you both guys right?

elisichi
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I'm a girl :D But close enough!

EmmaH
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hu ....but thanks anyways

elisichi
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Anytime!

AriPotta
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i'm a

elisichi
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hahahahah

EmmaH
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lolo thats a way of saying it :)

AriPotta
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:)