anonymous
  • anonymous
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Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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anonymous
  • anonymous
http://www.icoachmath.com/problems/solution.aspx?Qversid=fqLF3Cf96cQ=#
cwrw238
  • cwrw238
if y varies directly with x then y = kx where k is a constant find k by plugging in the given values of y and x when y = 3 , x = 2 3 = k * 2 can you find k?

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anonymous
  • anonymous
@cwrw238 3/2?
cwrw238
  • cwrw238
divide both sides of the equation by 2 to find k right
anonymous
  • anonymous
@cwrw238 so the answers D right?
cwrw238
  • cwrw238
so now we have |dw:1366501494754:dw|
anonymous
  • anonymous
@cwrw238 can you help me with this one?
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cwrw238
  • cwrw238
can u see what i've done i've substituted 3/2 for k now to find y when x = 3 plug in 3 for x and work out the value of y
anonymous
  • anonymous
@cwrw238 9/2?
cwrw238
  • cwrw238
right
cwrw238
  • cwrw238
if y varies directly by x y = kx and k = y/x
anonymous
  • anonymous
@cwrw238 i dont understand the 2nd problem
cwrw238
  • cwrw238
now plug in the values of x and y y = -3 and x = 1 k = -3 / 1 = -3 y = -9 and x = 3 k = -9/3 = -3 also k = -15 / 5 = -3 so is this varying direct;y?
anonymous
  • anonymous
@cwrw238 no?
cwrw238
  • cwrw238
these values of y and x do satisfy the relation y = kx which is direct variation do you see that?
cwrw238
  • cwrw238
k - -3 in all 3 cases
anonymous
  • anonymous
@cwrw238 ohhhh okay so the answer would be A?
cwrw238
  • cwrw238
right there are 2 types of variation direct where y = kx and indirect where y = k / x
anonymous
  • anonymous
@cwrw238 thanks
anonymous
  • anonymous
@cwrw238 also can you help me with this last one?
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