anonymous
  • anonymous
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...:(
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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AriPotta
  • AriPotta
"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?
anonymous
  • anonymous
ok one sec..
anonymous
  • anonymous
-3?

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

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