anonymous
  • anonymous
Help ASAP For the inverse variation equation xy = k, what is the constant of variation, k, when x = –3 and y = –2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
–6 -2/3 3/2 6
skullpatrol
  • skullpatrol
Any ideas?
anonymous
  • anonymous
-2/3 would be my guess

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skullpatrol
  • skullpatrol
Guessing randomly doesn't work in math :-) Please give a reason.
anonymous
  • anonymous
because usually its x/y right? so the inverse would be y/x
skullpatrol
  • skullpatrol
You are correct that "usually" you see expressions like x/y in class and the inverse of x/y is y/x, but that is not what this question is asking for.
anonymous
  • anonymous
So its 6?
anonymous
  • anonymous
no that doesnt make sense
skullpatrol
  • skullpatrol
Yes. 6 is correct :-)
skullpatrol
  • skullpatrol
For the inverse variation equation xy = k, what is the constant of variation, k, when x = –3 and y = –2 x * y = k -3 (-2) = 6
anonymous
  • anonymous
Thank you! Can you help me with another one?
skullpatrol
  • skullpatrol
I can try.
anonymous
  • anonymous
The inverse variation equation shows the relationship between wavelength in meters, x, and frequency, y. y=3x10^8/x What is the wavelength for radio waves with frequency 3 × 10^9? 1 × 10^–1 m 3 × 10^–1 m 3 × 10^17 m 9 × 10^17 m
skullpatrol
  • skullpatrol
Any ideas?
skullpatrol
  • skullpatrol
|dw:1438892577073:dw|
anonymous
  • anonymous
so find y=3x10^8/x
skullpatrol
  • skullpatrol
Read the problem carefully. Decide what unknown number is being asked for.
anonymous
  • anonymous
3x10^9?
skullpatrol
  • skullpatrol
that's not an answer choice
anonymous
  • anonymous
I still dont understand
skullpatrol
  • skullpatrol
what is the question asking for?
anonymous
  • anonymous
What is the wavelength for radio waves with frequency 3 × 10^9
skullpatrol
  • skullpatrol
Good, where is the wavelength in the formula they gave you?
anonymous
  • anonymous
wavelength is x and frequency is y
skullpatrol
  • skullpatrol
so they want you to find x, right?
anonymous
  • anonymous
yes
skullpatrol
  • skullpatrol
|dw:1438893690522:dw|
skullpatrol
  • skullpatrol
|dw:1438893825211:dw|
skullpatrol
  • skullpatrol
Ok so far?
anonymous
  • anonymous
yes
skullpatrol
  • skullpatrol
Do you know how to solve for x?
anonymous
  • anonymous
I plugged it in but it came out to be 1
skullpatrol
  • skullpatrol
plugged what in?
anonymous
  • anonymous
is it A?
anonymous
  • anonymous
(3*10^9)=(3*10^8)/x
anonymous
  • anonymous
x=1/10
skullpatrol
  • skullpatrol
Correct :-)
anonymous
  • anonymous
Thank you!
skullpatrol
  • skullpatrol
Thanks for trying :D

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