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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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"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?
ok one sec..

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Other answers:

oh so its false?
yep. so now we can substitute -3 for k and 27 for y to see if x equals 9. 27 = -3x
does x = 9?
no x=3 it says so in the prob
no, that says when x = 3, y = -9. y and x can be any number. k is the only variable that is constant
ok sso its false though?
why do you think it's false? are you just guessing? :/
or did you do the math
i did the math -9=3k so -9/3=3k/3 k=-3 right o9r am i totaolly off?
yea, k = -3, but we're trying to find out what x equals when y = 27
yes! which is not 9. so it's false. good job :)
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.
yay :) =D :D =)
Sorry I just realised I came in a little too late
thanks guys...wait are you both guys right?
I'm a girl :D But close enough!
hu ....but thanks anyways
i'm a
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lolo thats a way of saying it :)

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