anonymous
  • anonymous
Can someone please explain how to solve this problem? Thanks. Determine whether y varies directly with x. If so, find the constant of variation k and write the equation. X Y 4 6.4 7 11.2 10 16 13 20.8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
no y does not varie as x
anonymous
  • anonymous
x/y should = to x in all examples
anonymous
  • anonymous
how does it not vary with x, how do i check it myself

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phi
  • phi
y varies directly with x means y= k x where k is some constant number. This is one of the simplest equations you will meet. if you have an (x,y) pair, you can replace the x and y in the equation and solve for k: for the first entry in your table, you have x=4 and y is 6.4 replace y with 6.4, and x with 4 in y = k x to get 6.4= k * 4 divide both sides by 4: 6.4/4 = k * 4/4 or k= 6.4/4 = 1.6 so your direct variation equation is y= 1.6 x if the other pairs in your table "work" then you can say they all have the same equation, and y varies directly with x (with k= 1.6) can you test the other (x,y) values in your table ?
anonymous
  • anonymous
yes, just give me a moment please
anonymous
  • anonymous
all x*1.6 equals the y values in the chart so y DOES directly vary with x, right?
phi
  • phi
yes
anonymous
  • anonymous
thank you so much, i think its easy now :D
phi
  • phi
yw
anonymous
  • anonymous
sorry it was my calcuation error....i did a calcualtion error for 13 and 20.8
anonymous
  • anonymous
i am very sorry

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